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A216821 Number of standardized 4-connected side polyominoes of inner site-perimeter n. 0
0, 1, 1, 5, 13, 54, 182, 782, 3080, 13250 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,4

LINKS

Table of n, a(n) for n=2..11.

J. Fortier, A. Goupil, J. Lortie and J. Tremblay, Exhaustive generation of gominoes, Theoretical Computer Science, 502 (2012), 76-87.

CROSSREFS

Sequence in context: A149541 A149542 A089794 * A039510 A149543 A149544

Adjacent sequences:  A216818 A216819 A216820 * A216822 A216823 A216824

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Sep 20 2012

STATUS

approved

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Last modified November 14 19:54 EST 2019. Contains 329128 sequences. (Running on oeis4.)