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Search: id:A035784
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| A035784 |
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Coordination sequence for C_47 lattice. |
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+0
1
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| 1, 4418, 3256066, 962492226, 153103850498, 15248694346562, 1043758929078018, 52316368750163266, 2010885935139876866, 61394690471405342018, 1530842851201184782082, 31883560021717307214658, 565114979085891272326146
(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))^47 if norm is even; otherwise 0.
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CROSSREFS
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Sequence in context: A050664 A039818 A116342 this_sequence A108008 A060363 A128194
Adjacent sequences: A035781 A035782 A035783 this_sequence A035785 A035786 A035787
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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 njas.
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