OFFSET
3,1
LINKS
S. Kurz, k-polyominoes.
EXAMPLE
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.
CROSSREFS
KEYWORD
nonn
AUTHOR
Sascha Kurz, Feb 07 2005
STATUS
approved