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Search: id:A101490
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| A101490 |
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G.f. satisfies A(x) = x*(1+A^2)^2/(1-A+A^2). |
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+0
3
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| 0, 1, 1, 3, 8, 25, 80, 267, 911, 3170, 11192, 39993, 144320, 525124, 1924196, 7093603, 26288928, 97878831, 365918064, 1372982706, 5168555770, 19514482964, 73876936272, 280363191353, 1066357904128, 4064204607372
(list; graph; listen)
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OFFSET
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0,4
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LINKS
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M. Bousquet-Melou, Limit laws for embedded trees
P. Flajolet and R. Sedgewick, Analytic Combinatorics, 2009; see page 413
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FORMULA
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a(n+1)=Sum_{k, 0<=k<=[n/2]}A039599(n-k,k)*A000108(k). - Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Apr 12 2007
G.f: x*c(x)*c(x^2*c(x)^2), c(x) the g.f. of A000108. [From Paul Barry (pbarry(AT)wit.ie), Jun 02 2009]
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CROSSREFS
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Sequence in context: A007563 A050383 A060404 this_sequence A148793 A161634 A148794
Adjacent sequences: A101487 A101488 A101489 this_sequence A101491 A101492 A101493
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KEYWORD
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nonn
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AUTHOR
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Ralf Stephan, Jan 21 2005
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