E.g.f.: (1-x^2)^(-3/2)*exp(-x^2+x/(1-x)).

Terms

a(0) =1a(1) =1a(2) =4a(3) =16a(4) =112a(5) =736a(6) =6736a(7) =62224a(8) =709696a(9) =8345152a(10) =113821696a(11) =1616855296a(12) =25666630144a(13) =425795339776