a(n) = A027642(n-1) / A089026(n).

Terms

a(0) =1a(1) =1a(2) =2a(3) =1a(4) =6a(5) =1a(6) =6a(7) =1a(8) =30a(9) =1a(10) =6a(11) =1a(12) =210a(13) =1a(14) =6a(15) =1a(16) =30a(17) =1a(18) =42a(19) =1a(20) =330a(21) =1a(22) =6a(23) =1a(24) =2730a(25) =1a(26) =6a(27) =1a(28) =30a(29) =1