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A035760
Coordination sequence for C_23 lattice.
1
1, 1058, 187266, 13408034, 523804162, 13053926690, 228751366018, 3013639296546, 31343842260994, 267120108528162, 1920511723360130, 11923933134635298, 65157237071384066, 318308216281781026, 1408463692886754178, 5707273421568956450, 21377026411532247042, 74604432883744337954
OFFSET
0,2
LINKS
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
KEYWORD
nonn,easy
AUTHOR
Joan Serra-Sagrista (jserra(AT)ccd.uab.es)
EXTENSIONS
Recomputed by N. J. A. Sloane, Nov 25 1998
STATUS
approved