a(n) = A061680(n!).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =15a(6) =15a(7) =3a(8) =5a(9) =135a(10) =135a(11) =99a(12) =99a(13) =9a(14) =63a(15) =21a(16) =21a(17) =459a(18) =459a(19) =135a(20) =19a(21) =15a(22) =15a(23) =15a(24) =21a(25) =189a(26) =189a(27) =585a(28) =585a(29) =18225