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A006801 Number of 2-dimensional directed animals of size n.
(Formerly M1440)
+0
1
1, 2, 5, 13, 34, 90, 239, 635, 1689, 4494, 11960, 31832, 84727, 225524, 600302, 1597904, 4253371, 11321838, 30137079, 80220557 (list; graph; listen)
OFFSET

0,2

REFERENCES

V. K. Bhat et al., Enumeration of directed compact site animals in two dimensions, J. Phys. A 19 (1986), 3261-3265.

CROSSREFS

Sequence in context: A114299 A112842 A097417 this_sequence A114173 A023425 A090827

Adjacent sequences: A006798 A006799 A006800 this_sequence A006802 A006803 A006804

KEYWORD

nonn

AUTHOR

njas

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Last modified July 23 17:35 EDT 2008. Contains 142285 sequences.


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