OFFSET
1,3
LINKS
C.-P. Chou and H. A. Witek, An Algorithm and FORTRAN Program for Automatic Computation of the Zhang-Zhang Polynomial of Benzenoids, MATCH: Commun. Math. Comput. Chem, 68 (2012) 3-30.
FORMULA
Chou and Witek give a g.f.
EXAMPLE
Triangle begins:
1
1 2
1 4 4
1 6 13 9
1 8 26 38 20
1 10 43 96 106 45
1 12 64 190 321 284 101
1 14 89 328 742 1006 742 227
1 16 118 518 1460 2660 3006 1900 510
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
N. J. A. Sloane, Dec 23 2012
STATUS
approved