Triangle T(n, k) = 1 + (n + k - n*k)*(2*n - k - n*(n-k)), read by rows.

Terms

a(0) =1a(1) =2a(2) =2a(3) =1a(4) =2a(5) =1a(6) =-8a(7) =0a(8) =0a(9) =-8a(10) =-31a(11) =-4a(12) =5a(13) =-4a(14) =-31a(15) =-74a(16) =-10a(17) =22a(18) =22a(19) =-10a(20) =-74a(21) =-143a(22) =-18a(23) =57a(24) =82a(25) =57a(26) =-18a(27) =-143a(28) =-244a(29) =-28