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Search: id:A158257
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| A158257 |
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G.f.: A(x) = exp(Sum_{n>=1} Lucas(n)*L(n)*x^n/n) such that Sum_{n>=1} L(n)*x^n/n = log(1+x*A(x)) where L(n) = A158258(n) and Lucas(n) = A000204(n). |
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+0
3
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| 1, 1, 2, 7, 44, 458, 7953, 225761, 10470604, 789302962, 96596105976, 19162936947418, 6158621106553275, 3204835468356347519, 2699695571885775547222, 3680716263445262350996413
(list; graph; listen)
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OFFSET
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0,3
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EXAMPLE
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G.f.: A(x) = 1 + x + 2*x^2 + 7*x^3 + 44*x^4 + 458*x^5 + 7953*x^6 +...
log(1+x*A(x)) = x + x^2/2 + 4*x^3/3 + 21*x^4/4 + 186*x^5/5 + 2482*x^6/6 +...
log(A(x)) = x + 3*x^2/2 + 16*x^3/3 + 147*x^4/4 + 2046*x^5/5 + 44676*x^6/6 +...
log(A(x)) = x + 3*1*x^2/2 + 4*4*x^3/3 + 7*21*x^4/4 + 11*186*x^5/5 + 18*2482*x^6/6 +...
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PROGRAM
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(PARI) {a(n)=local(A=1+x); if(n==0, 1, for(i=1, n, A=exp(sum(m=1, n, (fibonacci(m-1)+fibonacci(m+1))*x^m*polcoeff(log(1+x*A+x*O(x^m)), m))+x*O(x^n))); polcoeff(A, n))}
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CROSSREFS
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Cf. A158258, A158107 (variant), A000204 (Lucas).
Sequence in context: A077045 A128579 A001046 this_sequence A153522 A107354 A006118
Adjacent sequences: A158254 A158255 A158256 this_sequence A158258 A158259 A158260
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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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