a(n) = (2*n-1)*a(n-1) - (n-1)*a(n-2) with a(0) = a(1) = 1.
A002801
a(n) = (2*n-1)*a(n-1) - (n-1)*a(n-2) with a(0) = a(1) = 1.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =8a(4) =50a(5) =418a(6) =4348a(7) =54016a(8) =779804a(9) =12824540a(10) =236648024a(11) =4841363104a(12) =108748223128
External references
- oeis: A002801