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 A035777 Coordination sequence for C_40 lattice. 1
 1, 3200, 1708800, 366366080, 42340840960, 3070951360128, 153524473002240, 5639746542798720, 159505036253752320, 3599066875202445440, 66639047280436354816, 1035866362657624498560, 13775860435151438471680 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Seiichi Manyama, Table of n, a(n) for n = 0..10000 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. FORMULA a(n) = [x^(2n)] ((1+x)/(1-x))^40. MAPLE seq(coeff(series(((1+x)/(1-x))^40, x, n+1), x, n), n=0..30, 2); # Muniru A Asiru, Aug 12 2018 CROSSREFS Cf. A035735. Sequence in context: A035896 A224646 A231203 * A108001 A212074 A023308 Adjacent sequences: A035774 A035775 A035776 * A035778 A035779 A035780 KEYWORD nonn,easy AUTHOR Joan Serra-Sagrista (jserra(AT)ccd.uab.es) EXTENSIONS Recomputed by N. J. A. Sloane, Nov 25 1998 STATUS approved

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Last modified December 2 21:06 EST 2023. Contains 367526 sequences. (Running on oeis4.)