Triangle T(n,m) of the coefficients [x^m] of the polynomial ((x-1)*(x+2)*(x+1))^n, 0<=m<=3n.

Terms

a(0) =1a(1) =-2a(2) =-1a(3) =2a(4) =1a(5) =4a(6) =4a(7) =-7a(8) =-8a(9) =2a(10) =4a(11) =1a(12) =-8a(13) =-12a(14) =18a(15) =35a(16) =-6a(17) =-33a(18) =-10a(19) =9a(20) =6a(21) =1a(22) =16a(23) =32a(24) =-40a(25) =-120a(26) =1a(27) =160a(28) =76a(29) =-80