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A035765

Coordination sequence for C_28 lattice.

1, 1568, 410816, 43381856, 2485013888, 90102925472, 2275791199808, 42760427177696, 627099015232256, 7446658555097888, 73704171158808512, 622408788864127328, 4571394778282027136, 29672618403243206048, 172523643553950122304, 908874759952534074336, 4381165944112803116544

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OFFSET

0,2

LINKS

Seiichi Manyama, Table of n, a(n) for n = 0..10000

R. Bacher, P. de la Harpe and B. Venkov, Séries de croissance et séries d'Ehrhart associées aux réseaux de racines, C. R. Acad. Sci. Paris, 325 (Series 1) (1997), 1137-1142.

J. H. Conway and N. J. A. Sloane, Low-Dimensional Lattices VII: Coordination Sequences, Proc. Royal Soc. London, A453 (1997), 2369-2389 (pdf).

Joan Serra-Sagrista, Enumeration of lattice points in l_1 norm, Inf. Proc. Lett. 76 (1-2) (2000) 39-44.

FORMULA

a(n) = [x^(2n)] ((1+x)/(1-x))^28.

CROSSREFS

Sequence in context: A099542 A232672 A232036 * A107561 A260144 A221105