Triangle read by rows: T(n, k) = (-2)^k*binomial(n, k)*Euler(k, 1/2).

Terms

a(0) =1a(1) =1a(2) =0a(3) =1a(4) =0a(5) =-1a(6) =1a(7) =0a(8) =-3a(9) =0a(10) =1a(11) =0a(12) =-6a(13) =0a(14) =5a(15) =1a(16) =0a(17) =-10a(18) =0a(19) =25a(20) =0a(21) =1a(22) =0a(23) =-15a(24) =0a(25) =75a(26) =0a(27) =-61a(28) =1a(29) =0