9,2

A. J. Guttmann and A. R. Conway, Hexagonal lattice directed site animals, Statistical Physics on the Eve of the Twenty-First Century, ed. M. T. Batchelor, World Scientific, 1999 (H_9 for hexagonal lattices Table 1).

G.f.: x^9*B(x)/((1-x)^19*(1+x)^9*(1+x^2)^8*(1+x^2+x^4)^6*(1+x^4)^4*(1+x^2+x^4+x^6+x^8)^2) where B(x) is g.f. of A055918.

Sequence in context: A008418 A099196 A041618 this_sequence A071539 A125381 A126539

Adjacent sequences: A055912 A055913 A055914 this_sequence A055916 A055917 A055918

nonn

Christian G. Bower (bowerc(AT)usa.net), Jun 22 2000