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Search: id:A159594
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| A159594 |
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G.f.: A(x) = x*exp( Sum_{n>=1} [ D^n A(x) ]^n/n ), where differential operator D = x*d/dx. |
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1
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| 1, 1, 3, 16, 125, 1301, 17070, 272976, 5218727, 118508219, 3224104875, 108226321884, 4740041705554, 291705715765328, 26728599026539162, 3688459631229579912, 751246585455211054713, 208348432365596381718906
(list; graph; listen)
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OFFSET
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1,3
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FORMULA
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G.f.: A(x) = x*exp( Sum_{n>=1} [ Sum_{k>=1} k^n*a(k)*x^k ]^n/n ) where A(x) = Sum_{k>=1} a(k)*x^k.
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EXAMPLE
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G.f.: A(x) = x + x^2 + 3*x^3 + 16*x^4 + 125*x^5 + 1301*x^6 +...
A(x) = x*exp( Sum_{n>=1} [x + 2^n*a(2)*x^2 + 3^n*a(3)*x^3 +...]^n/n ).
D^n A(x) = x + 2^n*x^2 + 3^n*3*x^3 + 4^n*16*x^4 + 5^n*125*x^5 +...
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PROGRAM
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(PARI) {a(n)=local(A=1+x); for(i=1, n, A=x*exp(sum(m=1, n, sum(k=1, n, k^m*x^k*polcoeff(A, k)+x*O(x^n))^m/m))); polcoeff(A, n)}
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CROSSREFS
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Sequence in context: A000950 A000951 A000272 this_sequence A088358 A082161 A135752
Adjacent sequences: A159591 A159592 A159593 this_sequence A159595 A159596 A159597
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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), May 03 2009
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