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A176310 G.f.: exp( Sum_{n>=1} sigma(n*2^n)*x^n/n ). 4
1, 3, 12, 47, 157, 531, 1741, 5459, 16814, 51286, 152506, 447622, 1300571, 3721897, 10551143, 29663448, 82494469, 227701487, 624113377, 1697228926, 4586879327, 12323255188, 32904418872, 87395198231, 230972180615, 607363842960 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..25.

FORMULA

The logarithmic derivative is A176311.

PROG

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

CROSSREFS

Cf. A176311, A000203 (sigma).

Sequence in context: A047013 A108368 A216946 * A077829 A088132 A122450

Adjacent sequences:  A176307 A176308 A176309 * A176311 A176312 A176313

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Apr 15 2010

STATUS

approved

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Last modified April 24 15:13 EDT 2014. Contains 240985 sequences.