Triangle related to exp(x)*sec(2*x).

Terms

a(0) =1a(1) =0a(2) =1a(3) =4a(4) =0a(5) =1a(6) =0a(7) =12a(8) =0a(9) =1a(10) =80a(11) =0a(12) =24a(13) =0a(14) =1a(15) =0a(16) =400a(17) =0a(18) =40a(19) =0a(20) =1a(21) =3904a(22) =0a(23) =1200a(24) =0a(25) =60a(26) =0a(27) =1a(28) =0a(29) =27328