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A216819 Number of simply 8-connected polyominoes of site-perimeter n. 0
1, 0, 2, 4, 12, 32, 110, 340, 1209, 4256, 15974, 60232 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,3

LINKS

Table of n, a(n) for n=4..15.

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

CROSSREFS

Sequence in context: A148193 A002528 A216818 * A216820 A148194 A289501

Adjacent sequences:  A216816 A216817 A216818 * A216820 A216821 A216822

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Sep 20 2012

STATUS

approved

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Last modified October 22 22:34 EDT 2019. Contains 328335 sequences. (Running on oeis4.)