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 A207972 G.f.: exp( Sum_{n>=1} 5*Fibonacci(n^2) * x^n/n ). 5

%I

%S 1,5,20,115,1665,82650,12847310,5620114060,6659421195205,

%T 21082748688390045,177217804775828062850,3941798437750184226876305,

%U 231505293200405380457355524620,35848160499603817968830380832049915,14619744406297572472084577939841875791890

%N G.f.: exp( Sum_{n>=1} 5*Fibonacci(n^2) * x^n/n ).

%C Give g.f. A(x), note that A(x)^(1/5) is not an integer series.

%e G.f.: A(x) = 1 + 5*x + 20*x^2 + 115*x^3 + 1665*x^4 + 82650*x^5 + ...

%e such that

%e log(A(x))/5 = x + 3*x^2/2 + 34*x^3/3 + 987*x^4/4 + 75025*x^5/5 + 14930352*x^6/6 + 7778742049*x^7/7 + ... + Fibonacci(n^2)*x^n/n + ...

%o (PARI) {a(n)=polcoeff(exp(sum(k=1,n,5*fibonacci(k^2)*x^k/k)+x*O(x^n)),n)}

%o for(n=0,16,print1(a(n),", "))

%Y Cf. A054888, A207969, A207970, A207971, A054783, A207834, A211892.

%K nonn

%O 0,2

%A _Paul D. Hanna_, Feb 22 2012

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Last modified December 14 01:33 EST 2019. Contains 329978 sequences. (Running on oeis4.)