OFFSET
4,3
LINKS
R. C. Read, Contributions to the cell growth problem, Canad. J. Math., 14 (1962), 1-20.
EXAMPLE
Triangle starts:
1;
0,3;
0,6,15;
0,2,39,30;
...
There are T(5,2)=3 out of 12 pentominoes that fill the 4X2 shape: the L, N and Y. The F, T, V, W, X, and Z require both dimensions >= 3; the P and U would fit but not touch all sides; the I requires one dimension of 5. - R. J. Mathar, May 08 2019
CROSSREFS
KEYWORD
AUTHOR
N. J. A. Sloane, Feb 05 2001
STATUS
approved