Triangle formed from expansion of (x-1)*(x+2)*(x-3)*...*(x+-n).

Terms

a(0) =1a(1) =1a(2) =-1a(3) =1a(4) =1a(5) =-2a(6) =1a(7) =-2a(8) =-5a(9) =6a(10) =1a(11) =2a(12) =-13a(13) =-14a(14) =24a(15) =1a(16) =-3a(17) =-23a(18) =51a(19) =94a(20) =-120a(21) =1a(22) =3a(23) =-41a(24) =-87a(25) =400a(26) =444a(27) =-720a(28) =1a(29) =-4