[ exp(15/22)*n! ].

Terms

a(0) =1a(1) =3a(2) =11a(3) =47a(4) =237a(5) =1423a(6) =9966a(7) =79731a(8) =717584a(9) =7175842a(10) =78934269a(11) =947211229a(12) =12313745983a(13) =172392443766