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

Terms

a(0) =1a(1) =1a(2) =0a(3) =1a(4) =2a(5) =0a(6) =2a(7) =0a(8) =3a(9) =6a(10) =0a(11) =6a(12) =0a(13) =15a(14) =0a(15) =7a(16) =24a(17) =0a(18) =24a(19) =0a(20) =84a(21) =0a(22) =52a(23) =0a(24) =37a(25) =120a(26) =0a(27) =120a(28) =0a(29) =540