login
A216819
Number of simply 8-connected polyominoes of site-perimeter n.
1
1, 0, 2, 4, 12, 32, 110, 340, 1209, 4256, 15974, 60232
OFFSET
4,3
LINKS
J. Fortier, A. Goupil, J. Lortie and J. Tremblay, Exhaustive generation of gominoes, Theoretical Computer Science, 502 (2013), 76-87.
CROSSREFS
Cf. A216818 (no holes), A216820 (any holes).
A342537 counts free (rather than fixed) polyominoes with given area (rather than site-perimeter).
Sequence in context: A341344 A002528 A216818 * A216820 A148194 A289501
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Sep 20 2012
STATUS
approved