a(n) is the (1,2)-entry of the n-th power of the 2 X 2 matrix [0,-1;n-1,n-1].

A109519

a(n) is the (1,2)-entry of the n-th power of the 2 X 2 matrix [0,-1;n-1,n-1].

Terms

    a(0) =-1a(1) =-1a(2) =-2a(3) =-9a(4) =-80a(5) =-1000a(6) =-15336a(7) =-276115a(8) =-5705728a(9) =-133155495a(10) =-3464900000a(11) =-99490865760

External references