Triangle read by rows. T(n, k) = [x^k] (2 - Sum_{k=0..n} binomial(n, k)*Euler(k, 1)*(-2*x)^k).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =0a(6) =1a(7) =3a(8) =0a(9) =-2a(10) =1a(11) =4a(12) =0a(13) =-8a(14) =0a(15) =1a(16) =5a(17) =0a(18) =-20a(19) =0a(20) =16a(21) =1a(22) =6a(23) =0a(24) =-40a(25) =0a(26) =96a(27) =0a(28) =1a(29) =7