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A035760
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Coordination sequence for C_23 lattice.
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0
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1, 1058, 187266, 13408034, 523804162, 13053926690, 228751366018, 3013639296546, 31343842260994, 267120108528162, 1920511723360130, 11923933134635298, 65157237071384066, 318308216281781026
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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REFERENCES
| R. Bacher, P. de la Harpe and B. Venkov, Series de croissance et series d'Ehrhart associees aux reseaux de racines, C. R. Acad. Sci. Paris, 325 (Series 1) (1997), 1137-1142.
J. Serra-Sagrista, Enumeration of lattice points in l_1 norm, Information Processing Letters, 76, no. 1-2 (2000), 39-44.
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LINKS
| J. H. Conway and N. J. A. Sloane, Low-Dimensional Lattices VII: Coordination Sequences, Proc. Royal Soc. London, A453 (1997), 2369-2389 (Abstract, pdf, ps).
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FORMULA
| ((1+x)/(1-x))^23 if norm is even; otherwise 0.
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CROSSREFS
| Sequence in context: A035858 A120215 A202611 * A107556 A048895 A020374
Adjacent sequences: A035757 A035758 A035759 * A035761 A035762 A035763
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KEYWORD
| nonn,easy
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AUTHOR
| Serra-Sagrista, Joan; jserra(AT)ccd.uab.es
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EXTENSIONS
| Recomputed Nov 25 1998 by N. J. A. Sloane (njas(AT)research.att.com).
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