[ exp(3/17)*n! ].

Terms

a(0) =1a(1) =2a(2) =7a(3) =28a(4) =143a(5) =858a(6) =6012a(7) =48101a(8) =432915a(9) =4329155a(10) =47620715a(11) =571448591a(12) =7428831692a(13) =104003643691