E.g.f.: A(x) = 1/[(1 - x^2)^(1 + 1/x)].

Terms

a(0) =1a(1) =1a(2) =3a(3) =10a(4) =49a(5) =271a(6) =1861a(7) =14218a(8) =125945a(9) =1222525a(10) =13274551a(11) =155993586a(12) =2006410033a(13) =27654327715a(14) =411146102641