A107507 Coordination sequence for D_12 lattice

1, 264, 13488, 278168, 3237984, 25290408, 147204624, 684347448, 2666539200, 9015945800, 27141718896, 74182306776, 186879023392, 439124493288, 971672262864, 2040402823544, 4092008534400, 7879085829000, 14630516376112, 26297796632856, 45903762942432

Offset

0,2

Links

Table of n, a(n) for n=0..20.

Index entries for linear recurrences with constant coefficients, signature (12,-66,220,-495,792,-924,792,-495,220,-66,12,-1).

Formula

G.f.: (x^12 +252*x^11 +10386*x^10 +133516*x^9 +732591*x^8 +1956216*x^7 +2698108*x^6 +1956216*x^5 +732591*x^4 +133516*x^3 +10386*x^2 +252*x +1) / (x -1)^12. [Colin Barker, Nov 20 2012]

Crossrefs

Sequence in context: A278409 A168196 A264682 * A239183 A289062 A294181

Adjacent sequences: A107504 A107505 A107506 * A107508 A107509 A107510

Keyword

nonn,easy

Author

N. J. A. Sloane, May 28 2005

Status

approved