a(n) = n! a(n-1) / a(n-2), where a(0) = 1, a(1) = 1.
A372993
a(n) = n! a(n-1) / a(n-2), where a(0) = 1, a(1) = 1.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =12a(4) =144a(5) =1440a(6) =7200a(7) =25200a(8) =141120a(9) =2032128a(10) =52254720a(11) =1026432000a(12) =9408960000a(13) =57081024000a(14) =528881633280
External references
- oeis: A372993