A035786 Coordination sequence for C_49 lattice.

1, 4802, 3846402, 1235463362, 213469045762, 23082542932162, 1714286978300162, 93160372030893762, 3879015208550830082, 128171745658737612482, 3455162221991189940482, 77713577966625653414082

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))^49.

Crossrefs

Cf. A035744.

Sequence in context: A214146 A085322 A336536 * A108010 A029553 A153406

Adjacent sequences: A035783 A035784 A035785 * A035787 A035788 A035789

Keyword

nonn,easy

Author

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

Extensions

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

Status

approved