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A035774
Coordination sequence for C_37 lattice.
1
1, 2738, 1251266, 229731890, 22759419650, 1417045988658, 60920563283394, 1928517866520498, 47112663470291970, 920606667020062130, 14802580485176160706, 200402916980183383858, 2328223393508202424066
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))^37.
MAPLE
seq(coeff(series(((1+x)/(1-x))^37, x, n+1), x, n), n=0..30, 2); # Muniru A Asiru, Aug 12 2018
CROSSREFS
Cf. A035732.
Sequence in context: A221976 A337625 A094401 * A107570 A237680 A262819
KEYWORD
nonn,easy
AUTHOR
Joan Serra-Sagrista (jserra(AT)ccd.uab.es)
EXTENSIONS
Recomputed by N. J. A. Sloane, Nov 25 1998
STATUS
approved