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Search: id:A035870
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| A035870 |
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Coordination sequence for A_44 lattice. |
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+0
1
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| 1, 1980, 981090, 216711660, 27061623270, 2177841424572, 122794030719690, 5141202142881420, 166859335434401280, 4339352594947119860
(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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sum_{d=1}^44 C(45, d) C(m/2-1, d-1) C(44-d+m/2, m/2), where norm m is always even
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CROSSREFS
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Sequence in context: A061998 A108510 A125490 this_sequence A028238 A022063 A107527
Adjacent sequences: A035867 A035868 A035869 this_sequence A035871 A035872 A035873
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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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