OFFSET
3,2
LINKS
A. J. Guttmann, Indicators of solvability for lattice models, Discrete Math., 217 (2000), 167-189 (H_3 for hexagonal lattices of Section 6).
FORMULA
G.f.: x^3*(1+x)*(1+x+3x^3-x^4+x^5) / ((1-x)^7*(1+x)^3*(1+x^2)^2).
CROSSREFS
KEYWORD
nonn
AUTHOR
Christian G. Bower, Jun 14 2000
STATUS
approved