A220836 Triangle read by rows giving coefficients of Zhang-Zhang polynomial for benzenoidal system S(n).

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

Offset: 1

Author

N. J. A. Sloane, Dec 23 2012

Keywords

• nonn
• tabl

Examples

			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
...
		

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.

Crossrefs

Right hand diagonal is A052534.

Formula

Chou and Witek give a g.f.