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A035749
Coordination sequence for C_12 lattice.
3
1, 288, 14016, 284000, 3281280, 25534368, 148321344, 688686048, 2681291520, 9060853280, 27266245056, 74501171808, 187641279616, 440840828064, 975339085632, 2047881308384, 4106643801600, 7906687806240, 14680871849152, 26386944188256, 46057341900672, 78285175220640
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))^12.
CROSSREFS
Sequence in context: A168555 A163731 A223293 * A048145 A022154 A285923
KEYWORD
nonn,easy
AUTHOR
Joan Serra-Sagrista (jserra(AT)ccd.uab.es)
EXTENSIONS
Recomputed by N. J. A. Sloane, Nov 25 1998
STATUS
approved