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 A035767 Coordination sequence for C_30 lattice. 1
 1, 1800, 541200, 65520920, 4296107040, 177923724072, 5119703270960, 109262828065080, 1814077233023040, 24302419569598280, 270376971905976912, 2557028677258648920, 20954617154922097760, 151203821860764511080, 973794385663429365360, 5662556669152122153336 (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))^30. PROG (PARI) a(n) = polcoeff(Pol(((1+x)/(1-x))^30+O(x^(2*n+1))), 2*n); \\ Michel Marcus, Jul 07 2018 CROSSREFS Sequence in context: A069476 A179695 A025139 * A107563 A020402 A180685 Adjacent sequences:  A035764 A035765 A035766 * A035768 A035769 A035770 KEYWORD nonn,easy AUTHOR Recomputed by N. J. A. Sloane, Nov 25 1998 STATUS approved

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Last modified September 16 12:18 EDT 2021. Contains 347472 sequences. (Running on oeis4.)