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A023882 G.f.: 1/Product_{n>0} (1-n^n*x^n). 1
1, 1, 5, 32, 304, 3537, 52010, 895397, 18016416, 410889848, 10523505770, 298220329546, 9274349837081, 313761671751672, 11474635626789410, 450964042480390679, 18954785687060988578, 848386888530723146912 (list; graph; refs; listen; history; internal format)
OFFSET

0,3

FORMULA

Log of g.f.: sum_{k=1}^{\infty} {sigma(k, k+1) / k} x^k }, where sigma(k, q) is the sum of the q-th powers of the divisors of k.

CROSSREFS

Sequence in context: A001923 A023880 A104031 * A109780 A093448 A094653

Adjacent sequences:  A023879 A023880 A023881 * A023883 A023884 A023885

KEYWORD

nonn

AUTHOR

Olivier Gerard (olivier.gerard(AT)gmail.com)

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Last modified February 17 18:57 EST 2012. Contains 206074 sequences.