Define an array by d(m, 0) = 1, d(m, 1) = m; d(m, k) = (m - k + 1) d(m+1, k-1) - (k-1) (m+1) d(m+2, k-2). Sequence gives d(1,n).

A126962

Define an array by d(m, 0) = 1, d(m, 1) = m; d(m, k) = (m - k + 1) d(m+1, k-1) - (k-1) (m+1) d(m+2, k-2). Sequence gives d(1,n).

Terms

    a(0) =1a(1) =1a(2) =-2a(3) =-12a(4) =24a(5) =420a(6) =-720a(7) =-30240a(8) =40320a(9) =3764880a(10) =-3628800a(11) =-728481600a(12) =479001600a(13) =203545742400a(14) =-87178291200

External references