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 A067321 One-half of odd-indexed members of A067297. 3
 1, 32, 3072, 429760, 71386880, 13057591296, 2539643772928, 515384111218688, 107895796673347584, 23131454701441122304, 5052953723661587578880, 1120663604347562971103232, 251676943773831910414876672 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Table of n, a(n) for n=0..12. FORMULA a(n) = A067297(2n+1)/2. G.f.: A(x) = (f(y) - f(-y))/y with f(y) := (-1 + 9*y + (1+6*y)*c(y))/((1-y)*(1+5*y)*c(y) - 1 + 11*y - y^2) where c(y) is g.f. of A000108 (Catalan) and y=4*sqrt(x). CROSSREFS Cf. A067320 (even-indexed members of A067297). Sequence in context: A264115 A113500 A064018 * A104652 A219228 A135787 Adjacent sequences: A067318 A067319 A067320 * A067322 A067323 A067324 KEYWORD nonn,easy AUTHOR Wolfdieter Lang, Feb 05 2002 STATUS approved

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Last modified December 11 02:45 EST 2023. Contains 367717 sequences. (Running on oeis4.)