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A176361 G.f.: exp( Sum_{n>=1} sigma(n*2^(n-1))*x^n/n ). 1
1, 1, 4, 13, 33, 97, 273, 709, 1866, 5120, 13036, 33582, 87333, 219269, 555681, 1413270, 3488571, 8687949, 21624643, 52958400, 130132799, 319007916, 773803200, 1877699413, 4549855097, 10950145994, 26310132088, 63155284600 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..27.

FORMULA

The logarithmic derivative equals A176362.

PROG

(PARI) {a(n)=polcoeff(exp(sum(k=1, n, sigma(k*2^(k-1))*x^k/k)+x*O(x^n)), n)}

CROSSREFS

Cf. A176362, A176310, A000203 (sigma).

Sequence in context: A124669 A036894 A227122 * A322599 A135859 A161531

Adjacent sequences:  A176358 A176359 A176360 * A176362 A176363 A176364

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Apr 15 2010

STATUS

approved

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Last modified May 24 00:38 EDT 2019. Contains 323528 sequences. (Running on oeis4.)