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Search: id:A035757
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| A035757 |
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Coordination sequence for C_20 lattice. |
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+0
1
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| 1, 800, 107200, 5831520, 174074240, 3339504032, 45443741760, 469398016480, 3866465104640, 26364054632480, 153196621856192, 776310358810720, 3494968152620160, 14192829714542240, 52645836542006080
(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))^20 if norm is even; otherwise 0.
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CROSSREFS
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Sequence in context: A093280 A093240 A093220 this_sequence A023100 A107553 A031897
Adjacent sequences: A035754 A035755 A035756 this_sequence A035758 A035759 A035760
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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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