a(n) = A080502(n)/n.

Terms

a(0) =1a(1) =5a(2) =34a(3) =253a(4) =2024a(5) =16867a(6) =144575a(7) =1265032a(8) =11235584a(9) =101120256a(10) =919272960a(11) =842666880a(12) =7777077120a(13) =72150143040a(14) =67340133504a(15) =63131375160a(16) =594177648565