a(n) = A190339(n)/A224911(n).

Terms

a(0) =1a(1) =2a(2) =3a(3) =15a(4) =15a(5) =21a(6) =1155a(7) =165a(8) =2145a(9) =51051a(10) =255255a(11) =440895a(12) =440895a(13) =969a(14) =111435a(15) =248834355a(16) =248834355a(17) =2927463a(18) =5898837945a(19) =44352165a(20) =1641030105a(21) =8563193457a(22) =42815967285a(23) =80047243185a(25) =32898537309