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 A035849 Coordination sequence for A_23 lattice. 0
 1, 552, 76452, 4756952, 169447302, 3956576472, 66087441092, 839584669992, 8489857618992, 70764981877592, 499828461729852, 3059000328006312, 16519884821277962, 79920498285116712, 350767245201478812 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Table of n, a(n) for n=0..14. R. Bacher, P. de la Harpe and B. Venkov, Séries de croissance et séries d'Ehrhart associées aux réseaux de racines, C. R. Acad. Sci. Paris, 325 (Series 1) (1997), 1137-1142. J. H. Conway and N. J. A. Sloane, Low-Dimensional Lattices VII: Coordination Sequences, Proc. Royal Soc. London, A453 (1997), 2369-2389 (pdf). Joan Serra-Sagrista, Enumeration of lattice points in l_1 norm, Inf. Proc. Lett. 76 (1-2) (2000) 39-44. Index entries for linear recurrences with constant coefficients, signature (23, -253, 1771, -8855, 33649, -100947, 245157, -490314, 817190, -1144066, 1352078, -1352078, 1144066, -817190, 490314, -245157, 100947, -33649, 8855, -1771, 253, -23, 1). FORMULA Sum_{d=1..23} C(24, d)*C(m/2-1, d-1)*C(23-d+m/2, m/2), where norm m is always even. CROSSREFS Sequence in context: A282595 A290048 A023914 * A028686 A247531 A171428 Adjacent sequences: A035846 A035847 A035848 * A035850 A035851 A035852 KEYWORD nonn,easy AUTHOR Joan Serra-Sagrista (jserra(AT)ccd.uab.es) STATUS approved

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Last modified June 16 19:52 EDT 2024. Contains 373432 sequences. (Running on oeis4.)