OFFSET
0,7
REFERENCES
J. Brunvoll, S. J. Cyvin and B. N. Cyvin, Isomer enumeration of polygonal systems..., J. Molec. Struct. (Theochem), 364 (1996), 1-13.
EXAMPLE
Triangle begins:
1
1 1
1 1 1
3 4 4 1
9 16 16 4 1
39 85 84 32 7 1
169 439 465 210 57 7 1
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
N. J. A. Sloane, Aug 18 2006
STATUS
approved