A035760 Coordination sequence for C_23 lattice.

1, 1058, 187266, 13408034, 523804162, 13053926690, 228751366018, 3013639296546, 31343842260994, 267120108528162, 1920511723360130, 11923933134635298, 65157237071384066, 318308216281781026, 1408463692886754178, 5707273421568956450, 21377026411532247042, 74604432883744337954

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))^23.

Crossrefs

Sequence in context: A351770 A202611 A253678 * A107556 A237797 A237795

Adjacent sequences: A035757 A035758 A035759 * A035761 A035762 A035763

Keyword

nonn,easy

Author

Joan Serra-Sagrista (jserra(AT)ccd.uab.es)

Extensions

Recomputed by N. J. A. Sloane, Nov 25 1998

Status

approved