Let d(1)=1 and d(n) = d(n-1)*n^(2n-2)*(2n-1)^(3-2n). Then a(n)=numerator(d(n)).

A114876

Let d(1)=1 and d(n) = d(n-1)*n^(2n-2)*(2n-1)^(3-2n). Then a(n)=numerator(d(n)).

Terms

    a(0) =1a(1) =4a(2) =108a(3) =442368a(4) =51200000a(5) =52428800000

External references