OFFSET
3,1
LINKS
Matthias Koch and Sascha Kurz, Enumeration of generalized polyominoes, preprint, arXiv:math/0605144 [math.CO], 2006.
EXAMPLE
a(3)=66 because there are 66 polyiamonds consisting of 8 triangles and a(4)=369 because there are 369 polyominoes consisting of 8 squares.
CROSSREFS
KEYWORD
nonn
AUTHOR
Sascha Kurz, Jun 09 2006
STATUS
approved