[ exp(1/8)*n! ].

Terms

a(0) =1a(1) =2a(2) =6a(3) =27a(4) =135a(5) =815a(6) =5711a(7) =45688a(8) =411196a(9) =4111969a(10) =45231660a(11) =542779922a(12) =7056138986a(13) =98785945814