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A035785
Coordination sequence for C_48 lattice.
2
1, 4608, 3542016, 1091884544, 181095585792, 18801236605440, 1341056098444288, 70018291338395136, 2802193910116429824, 89036073583109693952, 2309183244948006190080, 49996383212627286763008
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))^48.
CROSSREFS
Cf. A035743.
Sequence in context: A078094 A159205 A170795 * A108009 A263115 A210350
KEYWORD
nonn,easy
AUTHOR
Joan Serra-Sagrista (jserra(AT)ccd.uab.es)
EXTENSIONS
Recomputed by N. J. A. Sloane, Nov 25 1998
STATUS
approved