A107506 Coordination sequence for D_11 lattice.

1, 220, 9482, 166188, 1660450, 11260876, 57581898, 237782204, 831240322, 2543995388, 6986455498, 17539148684, 40829208354, 89125931884, 184069213834, 362272019868, 683489419778, 1242224123932, 2183844052874, 3726523300588, 6190586013986, 10037135290380

Offset

0,2

Links

Table of n, a(n) for n=0..21.

Index entries for linear recurrences with constant coefficients, signature (11,-55,165,-330,462,-462,330,-165,55,-11,1).

Formula

G.f.: -(x +1)*(x^10 +208*x^9 +6909*x^8 +66912*x^7 +251010*x^6 +392864*x^5 +251010*x^4 +66912*x^3 +6909*x^2 +208*x +1) / (x -1)^11. [Colin Barker, Nov 20 2012]

Crossrefs

Cf. A007900.

Sequence in context: A022042 A095702 A271674 * A140918 A049023 A282591

Adjacent sequences: A107503 A107504 A107505 * A107507 A107508 A107509

Keyword

nonn,easy

Author

N. J. A. Sloane, May 28 2005

Status

approved