a(n) is the number of odd permutations (of an n-set) with exactly 1 fixed point.
A145222
a(n) is the number of odd permutations (of an n-set) with exactly 1 fixed point.
Terms
- a(0) =0a(1) =0a(2) =3a(3) =0a(4) =30a(5) =120a(6) =945a(7) =7392a(8) =66780a(9) =667440a(10) =7342335a(11) =88107360a(12) =1145396538a(13) =16035550440a(14) =240533257965
External references
- oeis: A145222