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A180606
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G.f.: A(x) = exp( Sum_{n>=1} (2^n-1)^(n-1)*x^n/n ).
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1
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1, 1, 2, 18, 862, 185582, 165592644, 599576207236, 8764375895813558, 516573425446007525398, 122710727732550268600238492, 117431929105754130321446873061820
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OFFSET
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0,3
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LINKS
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EXAMPLE
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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 +...
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PROG
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(PARI) {a(n)=polcoeff(exp(sum(m=1, n, (2^m-1)^(m-1)*x^m/m)+x*O(x^n)), n)}
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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