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A035865
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Coordination sequence for A_39 lattice.
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0
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1, 1560, 609180, 106132520, 10467167490, 666511018056, 29803201788620, 992289031501560, 25689723421331190, 534760876205721880, 9192140865272878812
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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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Table of n, a(n) for n=0..10.
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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sum_{d=1}^39 C(40, d) C(m/2-1, d-1) C(39-d+m/2, m/2), where norm m is always even
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CROSSREFS
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Sequence in context: A025026 A092001 A158773 * A031800 A072394 A035890
Adjacent sequences: A035862 A035863 A035864 * A035866 A035867 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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STATUS
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approved
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