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 A156212 G.f.: A(x) = exp( Sum_{n>=1} 2^(n^2)*A000204(n)*x^n/n ), a power series in x with integer coefficients. 1
 1, 2, 26, 732, 116390, 74067484, 206309321188, 2332635556428984, 108379291296448423558, 20417630652420537229303340, 15592143220454380480367922739340 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Compare to g.f. of Fibonacci sequence: exp( Sum_{n>=1} A000204(n)*x^n/n ), where A000204 is the Lucas numbers. LINKS EXAMPLE G.f.: A(x) = 1 + 2*x + 26*x^2 + 732*x^3 + 116390*x^4 + 74067484*x^5 +... log(A(x)) = 2*x + 2^4*3*x^2/2 + 2^9*4*x^3/3 + 2^16*7*x^4/4 + 2^25*11*x^5/5 +... PROG (PARI) {a(n)=polcoeff(exp(sum(m=1, n, 2^(m^2)*(fibonacci(m+1)+fibonacci(m-1))*x^m/m)+x*O(x^n)), n)} CROSSREFS Cf. A000045, A000204. Sequence in context: A090247 A206601 A156211 * A138524 A316747 A059516 Adjacent sequences:  A156209 A156210 A156211 * A156213 A156214 A156215 KEYWORD nonn AUTHOR Paul D. Hanna, Feb 06 2009 STATUS approved

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Last modified May 19 16:42 EDT 2019. Contains 323395 sequences. (Running on oeis4.)