Triangle read by rows: T(n,k) is the number of odd permutations of {1,2,...,n} with no fixed points and having k excedances (n>=1; k>=1).

A145880

Triangle read by rows: T(n,k) is the number of odd permutations of {1,2,...,n} with no fixed points and having k excedances (n>=1; k>=1).

Terms

    a(0) =0a(1) =1a(2) =0a(3) =0a(4) =1a(5) =4a(6) =1a(7) =0a(8) =10a(9) =10a(10) =0a(11) =1a(12) =26a(13) =81a(14) =26a(15) =1a(16) =0a(17) =56a(18) =406a(19) =406a(20) =56a(21) =0a(22) =1a(23) =120a(24) =1681a(25) =3816a(26) =1681a(27) =120a(28) =1a(29) =0

External references