a(n) = fibonorial(3*n)/(fibonorial(2*n+1)*fibonorial(n+1)), where fibonorial(n) = A003266(n).

A271421

a(n) = fibonorial(3*n)/(fibonorial(2*n+1)*fibonorial(n+1)), where fibonorial(n) = A003266(n).

Terms

    a(0) =1a(1) =4a(2) =119a(3) =23496a(4) =32149806a(5) =300214157831

External references