a(n) = (2n-1)*a(n-1) + 2*(n-2)*a(n-2).
A271212
a(n) = (2n-1)*a(n-1) + 2*(n-2)*a(n-2).
Terms
- a(0) =1a(1) =2a(2) =6a(3) =34a(4) =262a(5) =2562a(6) =30278a(7) =419234a(8) =6651846a(9) =118950658a(10) =2366492038a(11) =51837444642
External references
- oeis: A271212