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Search: id:A035748
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| A035748 |
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Coordination sequence for C_11 lattice. |
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+0
2
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| 1, 242, 9922, 170610, 1690370, 11414898, 58227906, 240089586, 838478850, 2564399090, 7039035586, 17664712562, 41110086402, 89719625842, 185263467202, 364571790066, 687750033410, 1249849661170
(list; graph; listen)
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OFFSET
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0,2
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REFERENCES
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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
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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
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((1+x)/(1-x))^11 if norm is even; otherwise 0.
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CROSSREFS
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Sequence in context: A070284 A160551 A006601 this_sequence A022153 A013472 A013478
Adjacent sequences: A035745 A035746 A035747 this_sequence A035749 A035750 A035751
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KEYWORD
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nonn,easy
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AUTHOR
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Serra-Sagrista, Joan; jserra(AT)ccd.uab.es
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EXTENSIONS
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Recomputed Nov 25 1998 by N. J. A. Sloane (njas(AT)research.att.com).
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