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 A001194 Expansion of an integral. (Formerly M2826 N1139) 0
 3, 9, 54, 450, 4725, 59535, 873180, 14594580, 273648375, 5685805125, 129636356850, 3217338674550, 86331921100425, 2490343877896875, 76844896803675000, 2525635608280785000, 88081541838792376875, 3248654513701342370625 (list; graph; refs; listen; history; text; internal format)
 OFFSET 2,1 REFERENCES L. Comtet, Advanced Combinatorics, Reidel, 1974, p. 167. N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence). N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). LINKS FORMULA a(n)=(2n-1)a(n-1)-3(n-1)(2n-7)!!, n>2. [Sean A. Irvine, Mar 23 2012] a(n) = 3*n*(n-1)*(2*n-4)!/(2^(n-1)*(n-2)!), n>=2. - Vaclav Kotesovec, Jan 05 2014 MATHEMATICA Table[3*n*(n-1)*(2*n-4)!/(2^(n-1)*(n-2)!), {n, 2, 20}] (* Vaclav Kotesovec, Jan 05 2014 *) CROSSREFS Sequence in context: A238906 A212418 A025226 * A032179 A233189 A175117 Adjacent sequences:  A001191 A001192 A001193 * A001195 A001196 A001197 KEYWORD nonn AUTHOR EXTENSIONS More terms from Sean A. Irvine, Mar 22 2012 STATUS approved

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Last modified October 14 07:31 EDT 2019. Contains 327995 sequences. (Running on oeis4.)