Triangle read by rows: T(n,k) = (-1)^(n-k)*(C(k+n-1,n-k)-2*C(k+n-1,n-k-1)) for n>=0 and 0<=k<=n.

Terms

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