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Search: id:A035767
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| A035767 |
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Coordination sequence for C_30 lattice. |
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+0
1
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| 1, 1800, 541200, 65520920, 4296107040, 177923724072, 5119703270960, 109262828065080, 1814077233023040, 24302419569598280, 270376971905976912, 2557028677258648920, 20954617154922097760, 151203821860764511080
(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))^30 if norm is even; otherwise 0.
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CROSSREFS
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Adjacent sequences: A035764 A035765 A035766 this_sequence A035768 A035769 A035770
Sequence in context: A090232 A035891 A025139 this_sequence A107563 A020402 A035868
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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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