Triangle read by rows: T(n,k) is the number of permutations of an n-set having k cycles of size > 1 (0<=k<=floor(n/2)).

A136394

Triangle read by rows: T(n,k) is the number of permutations of an n-set having k cycles of size > 1 (0<=k<=floor(n/2)).

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =5a(6) =1a(7) =20a(8) =3a(9) =1a(10) =84a(11) =35a(12) =1a(13) =409a(14) =295a(15) =15a(16) =1a(17) =2365a(18) =2359a(19) =315a(20) =1a(21) =16064a(22) =19670a(23) =4480a(24) =105a(25) =1a(26) =125664a(27) =177078a(28) =56672a(29) =3465

External references