A373637 Number of free n-celled polyiamonds to which two inequivalent cells can be adjoined such that the two resulting free (n+1)-celled polyiamonds are identical.

0, 0, 0, 0, 1, 0, 0, 3, 0, 1, 8, 0, 6, 24, 1, 22

Offset

1,8

Comments

Two cells that can be adjoined to an n-celled polyiamond are equivalent if there is an isomorphism between the two resulting (n+1)-celled polyiamonds that maps the adjoined cell of the first to the adjoined cell of the second.

Links

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

Pontus von Brömssen, Illustration up to n = 13.

Index entries for sequences related to polyominoes.

Crossrefs

Cf. A369366, A373635, A373636.

Sequence in context: A172249 A208758 A320161 * A291763 A161129 A011074

Adjacent sequences: A373634 A373635 A373636 * A373638 A373639 A373640

Keyword

nonn,more

Author

Pontus von Brömssen, Jun 13 2024

Status

approved