A035752 Coordination sequence for C_15 lattice.

1, 450, 34050, 1057730, 18347010, 209070018, 1732242690, 11180805570, 59064045570, 264870794690, 1036722552066, 3618706767810, 11457102844930, 33352168328130, 90257700222210, 229129634462146, 549758831116290, 1254544094546370, 2737341512717570, 5736763221834690

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))^15.

Crossrefs

Sequence in context: A204958 A189653 A232035 * A107548 A263820 A269884

Adjacent sequences: A035749 A035750 A035751 * A035753 A035754 A035755

Keyword

nonn,easy

Author

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

Extensions

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

Status

approved