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A035854
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Coordination sequence for A_28 lattice.
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0
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1, 812, 165242, 15055292, 780951962, 26359518332, 630816932522, 11367003681452, 161269749071102, 1864649147486972, 18058470057117602, 149786240635178252, 1083811462665042482, 6947150732631302732
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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REFERENCES
| 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
| 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
| Sum_{d=1}^28 C(29, d) C(m/2-1, d-1) C(28-d+m/2, m/2), where norm m is always even
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CROSSREFS
| Sequence in context: A093633 A045228 A158667 * A099116 A183820 A015159
Adjacent sequences: A035851 A035852 A035853 * A035855 A035856 A035857
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KEYWORD
| nonn,easy
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AUTHOR
| Serra-Sagrista, Joan; jserra(AT)ccd.uab.es
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