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 A155202 G.f.: A(x) = exp( Sum_{n>=1} (2^n - 1)^n * x^n/n ), a power series in x with integer coefficients. 7
 1, 1, 5, 119, 12783, 5739069, 10426379903, 76135573607705, 2234839096465512877, 263966776643953756165279, 125532809982533901346598445525, 240383033223427436734891985275952307 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS More generally, for m integer, exp( Sum_{n>=1} (m^n + y)^n * x^n/n ) is a power series in x and y with integer coefficients. LINKS EXAMPLE G.f.: A(x) = 1 + x + 5*x^2 + 119*x^3 + 12783*x^4 + 5739069*x^5 +... log(A(x)) = x + 3^2*x^2/2 + 7^3*x^3/3 + 15^4*x^4/4 + 31^5*x^5/5 +... PROG (PARI) {a(n)=polcoeff(exp(sum(m=1, n+1, (2^m-1)^m*x^m/m)+x*O(x^n)), n)} CROSSREFS Cf. A155200, A155202, A155810 (triangle), variants: A155205, A155209. Sequence in context: A065818 A139189 A338755 * A168599 A193328 A002008 Adjacent sequences: A155199 A155200 A155201 * A155203 A155204 A155205 KEYWORD nonn AUTHOR Paul D. Hanna, Feb 04 2009 STATUS approved

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Last modified December 6 16:00 EST 2022. Contains 358644 sequences. (Running on oeis4.)