A120103 - OEIS

A120103

Number of polyominoes consisting of 9 regular unit n-gons.

160, 1285, 14445, 6572, 14982, 65323, 280014, 664411, 1908239, 1314914, 1968684, 4158216, 9707046, 17054708, 33522023, 26019735, 33942901, 56537856, 100952307, 153177526, 251530341, 208524646, 254079408, 374310135, 586169115, 812395658

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OFFSET

3,1

LINKS

Table of n, a(n) for n=3..28.

Matthias Koch and Sascha Kurz, Enumeration of generalized polyominoes, preprint, arXiv:math.CO/0605144

EXAMPLE

a(3)=160 because there are 160 polyiamonds consisting of 9 triangles and a(4)=1285 because there are 1285 polyominoes consisting of 9 squares.

CROSSREFS

Cf. A000577, A000104, A000105, A000228, A103465, A103466, A103467, A103468, A103469, A103470, A103471, A103472, A103473, A103465, A120102, A120104.

Sequence in context: A234444 A166778 A236518 * A235655 A281404 A127409

Adjacent sequences: A120100 A120101 A120102 * A120104 A120105 A120106

KEYWORD

nonn

AUTHOR

Sascha Kurz, Jun 09 2006

STATUS

approved