Triangle read by rows. T(n, k) = Sum_{j=0..n-k} binomial(-n, j) * A268438(n - k, j).

Terms

a(0) =1a(1) =-1a(2) =1a(3) =2a(4) =-2a(5) =1a(6) =0a(7) =12a(8) =-3a(9) =1a(10) =-56a(11) =-120a(12) =28a(13) =-4a(14) =1a(15) =0a(16) =1680a(17) =-450a(18) =50a(19) =-5a(20) =1a(21) =15840a(22) =-30240a(23) =10416a(24) =-1080a(25) =78a(26) =-6a(27) =1a(28) =0a(29) =665280