a(n) = 5*(n-1)*a(n-1) -2*(n-1)*a(n-2) with a(0)=0, a(1)=2.
A108209
a(n) = 5*(n-1)*a(n-1) -2*(n-1)*a(n-2) with a(0)=0, a(1)=2.
Terms
- a(0) =0a(1) =2a(2) =10a(3) =92a(4) =1320a(5) =25664a(6) =628400a(7) =18544032a(8) =640243520a(9) =25313036288
External references
- oeis: A108209