

A151514


Number of 1sided snake polyominoes with n cells.


7



1, 1, 2, 5, 10, 24, 53, 126, 289, 686, 1604, 3792, 8925, 21051, 49638, 116858, 275480, 647573, 1525113, 3580673, 8423334, 19755938, 46422915, 108783480, 255359883, 597932342, 1402308318, 3281352516, 7689369625, 17982241557, 42108302007, 98422076879, 230322745835
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OFFSET

1,3


COMMENTS

A snake polyomino has 2 cells with 1 neighbor each, and (n2) cells with 2 neighbors each.  Arthur O'Dwyer, Dec 12 2022


LINKS

Eric Weisstein's World of Mathematics, Polyomino


CROSSREFS

A002013 counts 2sided (free) snake polyominoes.
A359068 gives the number of 1sided strip polyominoes (that is, snakes without holes) with n cells; A359068(n) < A151514(n) for n >= 7.


KEYWORD

nonn,hard,more


AUTHOR



EXTENSIONS



STATUS

approved



