A055914 Column 8 of triangle A055907.

1, 16, 130, 748, 3459, 13612, 47141, 147116, 421040, 1119827, 2796446, 6610818, 14893276, 32150509, 66807075, 134139807, 261101457, 494074770, 911085320, 1640685080, 2890653798, 4990940719, 8456978339, 14081784408, 23068258050

Offset

8,2

Links

Table of n, a(n) for n=8..32.

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_8 for hexagonal lattices Table 1).

Formula

G.f.: x^8*B(x)/((1-x)^17*(1+x)^8*(1+x^2)^7*(1+x^2+x^4)^5*(1+x^4)^3*(1+x^2+x^4+x^6+x^8)) where B(x) is g.f. of A055917.

Crossrefs

Sequence in context: A041486 A196642 A196595 * A255816 A335560 A253224

Adjacent sequences: A055911 A055912 A055913 * A055915 A055916 A055917

Keyword

nonn

Author

Christian G. Bower, Jun 22 2000

Status

approved