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A061257
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Euler transform of reduced totient function psi(n), cf. A002322.
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4
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1, 1, 2, 4, 7, 13, 21, 37, 58, 96, 153, 243, 376, 584, 897, 1353, 2046, 3060, 4552, 6714, 9862, 14386, 20898, 30198, 43427, 62159, 88600, 125804, 177881, 250615, 351819, 492203, 686294, 953954, 1321902, 1826394, 2516364, 3457332, 4737576, 6475332
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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LINKS
| N. J. A. Sloane, Transforms
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FORMULA
| G.f.: Product_{k=1..infinity} (1 - x^k)^(-psi(k)). a(n)=1/n*Sum_{k=1..n} a(n-k)*b(k), n>1, a(0)=1, b(k)=Sum_{d|k} d*psi(d), cf. A061258.
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CROSSREFS
| Cf. A002322, A061258, A006171, A001970, A061255, A061256.
Sequence in context: A026691 A018150 A019471 * A061255 A088111 A143823
Adjacent sequences: A061254 A061255 A061256 * A061258 A061259 A061260
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KEYWORD
| easy,nonn
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AUTHOR
| Vladeta Jovovic (vladeta(AT)eunet.rs), Apr 21 2001
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