[ exp(7/16)*n! ].

Terms

a(0) =1a(1) =3a(2) =9a(3) =37a(4) =185a(5) =1115a(6) =7806a(7) =62448a(8) =562039a(9) =5620395a(10) =61824349a(11) =741892191a(12) =9644598485a(13) =135024378793