A176361 G.f.: exp( Sum_{n>=1} sigma(n*2^(n-1))*x^n/n ).

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

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