Triangle T(n, k) = binomial(2*n-k, k)*(-4)^(n-k), read by rows.

Terms

a(0) =1a(1) =-4a(2) =1a(3) =16a(4) =-12a(5) =1a(6) =-64a(7) =80a(8) =-24a(9) =1a(10) =256a(11) =-448a(12) =240a(13) =-40a(14) =1a(15) =-1024a(16) =2304a(17) =-1792a(18) =560a(19) =-60a(20) =1a(21) =4096a(22) =-11264a(23) =11520a(24) =-5376a(25) =1120a(26) =-84a(27) =1a(28) =-16384a(29) =53248