Number of permutations of {1,2,...,n} that have no even fixed points.
A161132
Number of permutations of {1,2,...,n} that have no even fixed points.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =4a(4) =14a(5) =78a(6) =426a(7) =3216a(8) =24024a(9) =229080a(10) =2170680a(11) =25022880a(12) =287250480a(13) =3884393520a(14) =52370755920a(15) =812752093440
External references
- oeis: A161132