[ exp(7/12)*n! ].

Terms

a(0) =1a(1) =3a(2) =10a(3) =43a(4) =215a(5) =1290a(6) =9031a(7) =72253a(8) =650281a(9) =6502816a(10) =71530978a(11) =858371741a(12) =11158832641a(13) =156223656987