Triangular array read by rows. T(n,k) is the number of n-permutations that have at least k fixed points with n >= 1 and 1 <= k <= n.
A208956
Triangular array read by rows. T(n,k) is the number of n-permutations that have at least k fixed points with n >= 1 and 1 <= k <= n.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =4a(4) =1a(5) =1a(6) =15a(7) =7a(8) =1a(9) =1a(10) =76a(11) =31a(12) =11a(13) =1a(14) =1a(15) =455a(16) =191a(17) =56a(18) =16a(19) =1a(20) =1a(21) =3186a(22) =1331a(23) =407a(24) =92a(25) =22a(26) =1a(27) =1a(28) =25487a(29) =10655
External references
- oeis: A208956