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Search: id:A006801
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| A006801 |
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Number of 2-dimensional directed animals of size n.
(Formerly M1440)
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+0
1
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| 1, 2, 5, 13, 34, 90, 239, 635, 1689, 4494, 11960, 31832, 84727, 225524, 600302, 1597904, 4253371, 11321838, 30137079, 80220557
(list; graph; listen)
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OFFSET
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0,2
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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).
V. K. Bhat et al., Enumeration of directed compact site animals in two dimensions, J. Phys. A 19 (1986), 3261-3265.
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CROSSREFS
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Sequence in context: A114299 A112842 A097417 this_sequence A114173 A023425 A090827
Adjacent sequences: A006798 A006799 A006800 this_sequence A006802 A006803 A006804
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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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