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Search: id:A061160
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| A061160 |
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Numerators in expansion of Euler transform of b(n)=1/3. |
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+0
3
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| 1, 5, 50, 215, 646, 8711, 25475, 105925, 3091270, 11691247, 36809705, 445872155, 1364113925, 5085042010, 50975292560, 183383680088, 588817265695, 19512559194875, 62369303509475, 224877933068647, 2214198452392027
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Denominators of c(n) are 3^d(n), where d(n)=power of 3 in (3*n)!, cf. A004128.
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LINKS
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N. J. A. Sloane, Transforms
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FORMULA
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Numerators of c(n), where c(n)=1/(3*n)*Sum_{k=1..n} c(n-k)*sigma(k), n>0, c(0)=1.
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CROSSREFS
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Cf. A000712, A061159, A061161.
Sequence in context: A136919 A136920 A069540 this_sequence A064054 A036291 A060347
Adjacent sequences: A061157 A061158 A061159 this_sequence A061161 A061162 A061163
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KEYWORD
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easy,nonn
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AUTHOR
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Vladeta Jovovic (vladeta(AT)Eunet.yu), Apr 17 2001
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