

A131486


a(n) is the number of triangular polyominoes (polyiamonds) with n edges.


0



0, 0, 1, 0, 1, 0, 1, 0, 3, 0, 4, 1, 11, 1, 23, 4, 62, 11, 150, 38, 411, 118, 1081, 389
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OFFSET

1,9


COMMENTS

An ncelled polyiamond with perimeter p has (3n+p)/2 edges. The maximum number of edges in an ncelled polyiamond is 2n+1.


LINKS



CROSSREFS

Cf. A000577: Triangular polyominoes (or polyiamonds) with n cells. A057729: Number of triangular polyominoes (or polyiamonds) [A000577] with perimeter n. A131481: a(n) is the number of ncell polyiamonds (triangular polyominoes) with perimeter n+2.


KEYWORD

hard,more,nonn


AUTHOR



STATUS

approved



