Duplicate of A076099.

Terms

a(0) =1a(1) =2a(2) =8a(3) =3a(4) =4a(5) =18a(6) =5a(7) =6a(8) =7a(9) =9261000a(10) =9a(11) =10a(12) =11a(13) =12a(14) =329422500a(15) =13a(16) =14a(17) =15a(18) =16a(19) =17