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A180606
G.f.: A(x) = exp( Sum_{n>=1} (2^n-1)^(n-1)*x^n/n ).
1
1, 1, 2, 18, 862, 185582, 165592644, 599576207236, 8764375895813558, 516573425446007525398, 122710727732550268600238492, 117431929105754130321446873061820
OFFSET
0,3
EXAMPLE
G.f.: A(x) = 1 + x + 2*x^2 + 18*x^3 + 862*x^4 + 185582*x^5 +...
log(A(x)) = x + 3*x^2/2 + 7^2*x^3/3 + 15^3*x^4/4 + 31^4*x^5/5 +...
PROG
(PARI) {a(n)=polcoeff(exp(sum(m=1, n, (2^m-1)^(m-1)*x^m/m)+x*O(x^n)), n)}
CROSSREFS
Cf. A180602.
Sequence in context: A131631 A306789 A015190 * A334553 A369677 A013040
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Sep 26 2010
STATUS
approved