Number of permutations of [n] that contain at least two fixed points in a succession.
A209256
Number of permutations of [n] that contain at least two fixed points in a succession.
Terms
- a(0) =0a(1) =0a(2) =1a(3) =1a(4) =4a(5) =18a(6) =93a(7) =579a(8) =4165a(9) =34031a(10) =311528a(11) =3158978a(12) =35154907a(13) =426029455a(14) =5585287179a(15) =78767551059
External references
- oeis: A209256