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Search: id:A067321
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A067321 One half of odd indexed members of A067297. +0
4
1, 32, 3072, 429760, 71386880, 13057591296, 2539643772928, 515384111218688, 107895796673347584, 23131454701441122304, 5052953723661587578880, 1120663604347562971103232, 251676943773831910414876672 (list; graph; listen)
OFFSET

0,2

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: A136246 A113500 A064018 this_sequence A104652 A135787 A016793

Adjacent sequences: A067318 A067319 A067320 this_sequence A067322 A067323 A067324

KEYWORD

nonn,easy

AUTHOR

Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de), Feb 5 2002

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Last modified December 20 16:54 EST 2009. Contains 171081 sequences.


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