a(n) = 2*(n-1)*a(n-1) -(n-1)*a(n-2) with a(0)=0, a(1)=1.
A108204
a(n) = 2*(n-1)*a(n-1) -(n-1)*a(n-2) with a(0)=0, a(1)=1.
Terms
- a(0) =0a(1) =1a(2) =2a(3) =6a(4) =30a(5) =216a(6) =2010a(7) =22824a(8) =305466a(9) =4704864a(10) =81938358a(11) =1591718520a(12) =34116485502a(13) =799695029808
External references
- oeis: A108204