a(n) gives the denominators for A250031(n) as well as for A250032(n).

Terms

a(0) =1a(1) =2a(2) =2a(3) =24a(4) =15a(5) =45a(6) =35a(7) =280a(8) =630a(9) =2100a(10) =2310a(11) =27720a(12) =10010a(13) =140140a(14) =150150a(15) =480480a(16) =255255a(17) =2297295a(18) =4849845a(19) =96996900a(20) =101846745a(21) =106696590a(22) =111546435a(23) =669278610a(24) =929553625a(25) =966735770a(26) =1003917915a(27) =3123300180a(28) =3234846615a(29) =48522699225