a(n) = 4*(n-1)*a(n-1) -2*(n-1)*a(n-2), with a(0)=0, a(1)=2.
A108208
a(n) = 4*(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) =8a(3) =56a(4) =624a(5) =9536a(6) =184480a(7) =4313088a(8) =118183744a(9) =3712870400a(10) =131536027008
External references
- oeis: A108208