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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 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: A108368 A264514 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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