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Search: id:A035756
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| A035756 |
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Coordination sequence for C_19 lattice. |
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+0
1
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| 1, 722, 87362, 4298066, 116323586, 2029779538, 25216532290, 238745924050, 1810015572994, 11406058224594, 61497762026306, 290259969857618, 1221518092836098, 4652599114237778, 16237772840882498, 52462123239704786
(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))^19 if norm is even; otherwise 0.
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CROSSREFS
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Sequence in context: A139154 A139165 A133531 this_sequence A107552 A023680 A002769
Adjacent sequences: A035753 A035754 A035755 this_sequence A035757 A035758 A035759
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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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