[ exp(7/8)*n! ].

Terms

a(0) =2a(1) =4a(2) =14a(3) =57a(4) =287a(5) =1727a(6) =12090a(7) =96722a(8) =870503a(9) =8705038a(10) =95755425a(11) =1149065104a(12) =14937846352a(13) =209129848929