a(1) = 1, a(2) = 2; for n>2, a(n) = 3*(n-2)*(n-2)!.
A083746
a(1) = 1, a(2) = 2; for n>2, a(n) = 3*(n-2)*(n-2)!.
Terms
- a(0) =1a(1) =2a(2) =3a(3) =12a(4) =54a(5) =288a(6) =1800a(7) =12960a(8) =105840a(9) =967680a(10) =9797760a(11) =108864000a(12) =1317254400a(13) =17244057600a(14) =242853811200
External references
- oeis: A083746