A093364 with duplicates removed.

Terms

a(0) =0a(1) =1a(2) =2a(3) =6a(4) =30a(5) =150a(6) =210a(7) =13860a(8) =60060a(9) =420420a(10) =4144140a(11) =9699690a(12) =87297210a(13) =717777060a(14) =4180566390a(15) =18846497670a(16) =26004868890