a(0) = 1, a(1) = 3, a(n) = 3*n*a(n-1) + 2*a(n-2).
A305460
a(0) = 1, a(1) = 3, a(n) = 3*n*a(n-1) + 2*a(n-2).
Terms
- a(0) =1a(1) =3a(2) =20a(3) =186a(4) =2272a(5) =34452a(6) =624680a(7) =13187184a(8) =317741776a(9) =8605402320a(10) =258797553152
External references
- oeis: A305460