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A216818 Number of simply 4-connected polyominoes of site-perimeter n. 0
1, 0, 2, 4, 12, 32, 110, 340, 1193, 4080, 14786, 53428 (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: A039721 A148193 A002528 * A216819 A216820 A148194

Adjacent sequences:  A216815 A216816 A216817 * A216819 A216820 A216821

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Sep 20 2012

STATUS

approved

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Last modified November 20 02:34 EST 2019. Contains 329323 sequences. (Running on oeis4.)