OFFSET
3,1
LINKS
Matthias Koch and Sascha Kurz, Enumeration of generalized polyominoes, arXiv:math.CO/0605144
S. Kurz, k-polyominoes.
EXAMPLE
a(3)=24 because there are 24 polyiamonds consisting of 7 triangles and a(4)=108 because there are 108 polyominoes consisting of 7 squares.
CROSSREFS
KEYWORD
nonn
AUTHOR
Sascha Kurz, Feb 07 2005
EXTENSIONS
More terms from Sascha Kurz, Jun 09 2006
STATUS
approved