E.g.f.: exp(x/(1-x^2))/sqrt(1-x^2).

Terms

a(0) =1a(1) =1a(2) =2a(3) =10a(4) =40a(5) =296a(6) =1936a(7) =17872a(8) =164480a(9) =1820800a(10) =21442816a(11) =279255296a(12) =3967316992a(13) =59837670400a(14) =988024924160