Triangle read by rows: T(n,k) is the number of permutations of [n] having k strong fixed points (0 <= k <= n).

A145878

Triangle read by rows: T(n,k) is the number of permutations of [n] having k strong fixed points (0 <= k <= n).

Terms

    a(0) =1a(1) =0a(2) =1a(3) =1a(4) =0a(5) =1a(6) =3a(7) =2a(8) =0a(9) =1a(10) =14a(11) =6a(12) =3a(13) =0a(14) =1a(15) =77a(16) =29a(17) =9a(18) =4a(19) =0a(20) =1a(21) =497a(22) =160a(23) =45a(24) =12a(25) =5a(26) =0a(27) =1a(28) =3676a(29) =1031

External references