[ exp(13/22)*n! ].

Terms

a(0) =1a(1) =3a(2) =10a(3) =43a(4) =216a(5) =1300a(6) =9100a(7) =72802a(8) =655226a(9) =6552267a(10) =72074937a(11) =864899252a(12) =11243690277a(13) =157411663885