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Search: id:A158259
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| A158259 |
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L.g.f.: exp(Sum_{n>=1} a(n)*x^n/n) = 1 + x*exp(Sum_{n>=1} C(2n-1,n)*a(n)*x^n/n) where C(2n-1,n) = A001700(n-1). |
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+0
2
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| 1, 1, 4, 53, 2321, 351010, 189198136, 371045084781, 2686134761118382, 72555484959298332681, 7372783651816395650943931, 2836907736669733620359204710274, 4155363917021399525198623243750199333
(list; graph; listen)
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OFFSET
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0,3
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FORMULA
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L.g.f.: exp(Sum_{n>=1} a(n)*x^n/n) = 1 + x*G(x) where G(x) = g.f. of A158109.
exp(Sum_{n>=1} a(n)*x^n/n) = [1 + Sum_{n>=1} C(2n-1,n)*a(n)*x^n]/[1 + Sum_{n>=1} (C(2n-1,n)-1)*a(n)*x^n].
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EXAMPLE
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L.g.f.: A(x) = x + 1*x^2/2 + 4*x^3/3 + 53*x^4/4 + 2321*x^5/5 +...
exp(A(x)) = 1 + x + 2*x^2 + 15*x^3 + 479*x^4 + 58981*x^5 +...
exp(A(x)) = 1 + x*G(x) where G(x) is the g.f. of A158109 such that:
log(G(x)) = x + 3*1*x^2/2 + 10*4*x^3/3 + 35*53*x^4/4 + 126*2321*x^5/5 +...
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PROGRAM
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(PARI) {a(n)=local(A=x+x^2); if(n==0, 1, for(i=1, n-1, A=log(1+x*exp(sum(m=1, n, binomial(2*m-1, m)*x^m*polcoeff(A+x*O(x^m), m) )+x*O(x^n)))); n*polcoeff(A, n))}
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CROSSREFS
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Cf. A158109, A158258 (variant), A001700.
Sequence in context: A111034 A109801 A099340 this_sequence A095210 A156469 A001545
Adjacent sequences: A158256 A158257 A158258 this_sequence A158260 A158261 A158262
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KEYWORD
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nonn
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AUTHOR
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Paul D. Hanna (pauldhanna(AT)juno.com), Mar 28 2009
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