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

Author

N. J. A. Sloane, Sep 20 2012

Keywords

• nonn
• more

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).