n! in base 9.

Terms

a(0) =1a(1) =1a(2) =2a(3) =6a(4) =26a(5) =143a(6) =880a(7) =6820a(8) =61270a(9) =612700a(10) =6740700a(11) =83088500a(12) =1211283600a(13) =17058212600a(14) =270017301300