OFFSET
3,1
LINKS
Matthias Koch and Sascha Kurz, Enumeration of generalized polyominoes, preprint arXiv:math/0605144 [math.CO], 2006.
EXAMPLE
a(3)=448 because there are 448 polyiamonds consisting of 10 triangles;
a(4)=4655 because there are 4655 polyominoes consisting of 10 squares.
CROSSREFS
KEYWORD
nonn
AUTHOR
Sascha Kurz, Jun 09 2006
STATUS
approved