A067321 - OEIS

A067321

One-half of odd-indexed members of A067297.

1, 32, 3072, 429760, 71386880, 13057591296, 2539643772928, 515384111218688, 107895796673347584, 23131454701441122304, 5052953723661587578880, 1120663604347562971103232, 251676943773831910414876672

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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