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Search: id:A035869
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| A035869 |
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Coordination sequence for A_43 lattice. |
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1
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| 1, 1892, 895862, 189126212, 22576717592, 1737436100444, 93714991099466, 3755363400343676, 116715616046942726, 2908413970471697116, 4323892738089960570
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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}^43 C(44, d) C(m/2-1, d-1) C(43-d+m/2, m/2), where norm m is always even
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CROSSREFS
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Adjacent sequences: A035866 A035867 A035868 this_sequence A035870 A035871 A035872
Sequence in context: A106764 A086476 A020321 this_sequence A045198 A020417 A078862
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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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