A057779 Number of hexagonal polyominoes (or polyhexes, A000228) with perimeter 2n.

0, 0, 1, 0, 1, 1, 3, 2, 12, 14, 50, 98, 313, 750, 2308, 6270

Offset

1,7

Links

Table of n, a(n) for n=1..16.

Andrew Clarke, Isoperimetrical Polyhexes

Picture from Andrew Clarke's page showing the polyhexes of perimeters 6, 8, ... 16.

Crossrefs

Cf. A000228, A000105, A057730, A258206 (counts only polyhexes without holes).

Sequence in context: A267011 A258206 A258019 * A005220 A243660 A220883

Adjacent sequences: A057776 A057777 A057778 * A057780 A057781 A057782

Keyword

nonn,nice,more

Author

N. J. A. Sloane, Oct 29 2000

Extensions

Link updated by William Rex Marshall, Dec 16 2009

a(13)-a(16) from John Mason, Jul 26 2021

Status

approved