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Table of n, a(n) for n=3..40.
S. Kurz, k-polyominoes.
a(3)=12 because there are 12 polyiamonds consisting of 6 triangles and a(4)=35 because there are 35 polyominoes consisting of 6 squares.
Cf. A103469, A103470, A103471, A103473.
Sequence in context: A195858 A121805 A195542 * A009649 A195539 A007794
Adjacent sequences: A103469 A103470 A103471 * A103473 A103474 A103475
Sascha Kurz, Feb 07 2005