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Search: id:A005407
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| A005407 |
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Number of protruded partitions of n with largest part at most 6.
(Formerly M2570)
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+0
1
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| 1, 3, 6, 13, 25, 50, 93, 175, 320, 582, 1041, 1851, 3253, 5682, 9848, 16970, 29070, 49559, 84090, 142107, 239239, 401404, 671386, 1119799, 1862861, 3091708, 5120090, 8462535, 13961695, 22996307, 37819865, 62112581, 101879568
(list; graph; listen)
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OFFSET
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1,2
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
R. P. Stanley, A Fibonacci lattice, Fib. Quart., 13 (1975), 215-232.
R. P. Stanley, Ordered structures and partitions, Memoirs of the Amer. Math. Soc., no. 119 (1972).
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FORMULA
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G.f. = (1-x)^6/Product(1-x-x^i+x^(1+2*i), i=1..6)-1. - Emeric Deutsch (deutsch(AT)duke.poly.edu), Dec 19 2004
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MAPLE
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G:=(1-x)^6/Product(1-x-x^i+x^(1+2*i), i=1..6)-1: Gser:=series(G, x=0, 39): seq(coeff(Gser, x^n), n=1..37); (Deutsch)
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CROSSREFS
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Sequence in context: A048039 A131913 A005406 this_sequence A005116 A121349 A074890
Adjacent sequences: A005404 A005405 A005406 this_sequence A005408 A005409 A005410
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
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More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Dec 19 2004
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