OFFSET
1,2
REFERENCES
S. R. Finch, Mathematical Constants, Cambridge, 2003, Section 1.2.5.
LINKS
Simon Plouffe, Fibonacci factorials.
Eric Weisstein's World of Mathematics, Fibonorial, Fibonacci Factorial Constant.
FORMULA
a(n) ~ 5*phi^(2*n^2 - 3*n - 2)/C where phi = (1+sqrt(5))/2, and C = (-1/phi^2; -1/phi^2)_inf is the Fibonacci factorial constant whose decimal expansion is given in A062073.
MATHEMATICA
Table[Fibonorial[3 n]/(Fibonorial[2 n + 1] Fibonorial[n + 1]), {n, 1, 30}] (* The sequence itself *)
QPochhammer[-1/GoldenRatio^2] (* The Fibonacci factorial constant C in the asymptotic expansion *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Vladimir Reshetnikov, May 21 2016
STATUS
approved