A216819 Number of simply 8-connected polyominoes of site-perimeter n.

1, 0, 2, 4, 12, 32, 110, 340, 1209, 4256, 15974, 60232

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 (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

Adjacent sequences: A216816 A216817 A216818 * A216820 A216821 A216822

Keyword

nonn,more

Author

N. J. A. Sloane, Sep 20 2012

Status

approved