Triangle read by rows: T(n,k) is the number of odd permutations (of an n-set) with exactly k fixed points.

A145225

Triangle read by rows: T(n,k) is the number of odd permutations (of an n-set) with exactly k fixed points.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =1a(4) =0a(5) =0a(6) =0a(7) =3a(8) =0a(9) =0a(10) =6a(11) =0a(12) =6a(13) =0a(14) =0a(15) =20a(16) =30a(17) =0a(18) =10a(19) =0a(20) =0a(21) =135a(22) =120a(23) =90a(24) =0a(25) =15a(26) =0a(27) =0a(28) =924a(29) =945

External references