a(n)=(2n)!*(sum{k=1...2n}1/k)/(2n+1).

A114450

a(n)=(2n)!*(sum{k=1...2n}1/k)/(2n+1).

Terms

    a(0) =0a(1) =1a(2) =10a(3) =252a(4) =12176a(5) =966240a(6) =114341760a(7) =18897709824

External references