A035763 Coordination sequence for C_26 lattice.

1, 1352, 305552, 27866072, 1381251872, 43450388072, 955155127472, 15676069223672, 201600442152512, 2108023030802312, 18450678628904912, 138377129954866712, 906470174221250912, 5269738713907663016, 27553145660154405616, 131043312279329242936, 572425326844812029056

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))^26.

Crossrefs

Sequence in context: A035889 A192320 A237310 * A107559 A056103 A259249

Adjacent sequences: A035760 A035761 A035762 * A035764 A035765 A035766

Keyword

nonn,easy

Author

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

Extensions

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

Status

approved