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A061159 Numerators in expansion of Euler transform of b(n)=1/2. 2
1, 1, 7, 17, 203, 455, 2723, 6001, 133107, 312011, 1613529, 3705303, 39159519, 88466147, 443939867, 1041952049, 40842931395, 93889422323, 460998957853, 1054706036923, 10194929714949, 23513104814105, 111438617932133 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

Denominators of c(n) are 2^d(n), where d(n)=power of 2 in (2n)!, cf. A005187.

LINKS

Table of n, a(n) for n=0..22.

N. J. A. Sloane, Transforms

FORMULA

Numerators of c(n), where c(n)=1/(2*n)*Sum_{k=1..n} c(n-k)*sigma(k), n>0, c(0)=1.

CROSSREFS

Cf. A000712, A061160, A061161.

Sequence in context: A244279 A214149 A147643 * A178694 A140122 A092240

Adjacent sequences:  A061156 A061157 A061158 * A061160 A061161 A061162

KEYWORD

easy,nonn,frac

AUTHOR

Vladeta Jovovic, Apr 17 2001

STATUS

approved

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Last modified October 22 21:52 EDT 2014. Contains 248411 sequences.