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 A280845 a(n) = 16^n * n * (n!)^4. 1
 0, 16, 8192, 15925248, 86973087744, 1087163596800000, 27052109211893760000, 1212439465398129131520000, 90809637490664903729479680000, 10724436568372543800644091248640000, 1906566501044007786781171777536000000000, 491287106495421596910231193510320537600000000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Daniel Suteu, Table of n, a(n) for n = 0..50 FORMULA a(n) ~ Pi/4 * A134374(n). a(n) ~ Pi^2 * 4^(2n + 1) / exp(4n) * n^(4n + 3). Lim_{n->infinity} a(n) / ((2n+1)!)^2 = Pi/4. PROG (PARI) a(n) = 16^n * n * (n!)^4; CROSSREFS Cf. A134374, A280100. Sequence in context: A079920 A203390 A221085 * A069986 A265177 A151641 Adjacent sequences:  A280842 A280843 A280844 * A280846 A280847 A280848 KEYWORD nonn,easy AUTHOR Daniel Suteu, Jan 09 2017 STATUS approved

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Last modified April 19 06:59 EDT 2019. Contains 322237 sequences. (Running on oeis4.)