Expansion of e.g.f.: exp(t*x)/(1 - x^2/t - t^3*x^3).

Terms

a(0) =1a(1) =0a(2) =1a(3) =2a(4) =0a(5) =0a(6) =1a(7) =0a(8) =6a(9) =0a(10) =0a(11) =7a(12) =24a(13) =0a(14) =0a(15) =12a(16) =0a(17) =0a(18) =25a(19) =0a(20) =120a(21) =0a(22) =0a(23) =260a(24) =0a(25) =0a(26) =61a(27) =720a(28) =0a(29) =0