a(n) = A108994(n)*2/(n+2) for n>=0.

A108995

a(n) = A108994(n)*2/(n+2) for n>=0.

Terms

    a(0) =1a(1) =2a(2) =9a(3) =72a(4) =890a(5) =15456a(6) =352807a(7) =10093728a(8) =349534881a(9) =14270091790a(10) =672991000968

External references