Triangle read by rows: T(n,k) is number of non-derangement permutations of {1,2,...,n} having k cycles (1 <= k <= n).

A162971

Triangle read by rows: T(n,k) is number of non-derangement permutations of {1,2,...,n} having k cycles (1 <= k <= n).

Terms

    a(0) =1a(1) =0a(2) =1a(3) =0a(4) =3a(5) =1a(6) =0a(7) =8a(8) =6a(9) =1a(10) =0a(11) =30a(12) =35a(13) =10a(14) =1a(15) =0a(16) =144a(17) =210a(18) =85a(19) =15a(20) =1a(21) =0a(22) =840a(23) =1414a(24) =735a(25) =175a(26) =21a(27) =1a(28) =0a(29) =5760

External references