Number of functions f:[n]->[n] such that no k exists such that |f^(-1)(k)| = k.

A331537

Number of functions f:[n]->[n] such that no k exists such that |f^(-1)(k)| = k.

Terms

    a(0) =1a(1) =0a(2) =1a(3) =11a(4) =109a(5) =1369a(6) =20746a(7) =369949a(8) =7593125a(9) =176345201a(10) =4572347206a(11) =130931415361

External references