Denominators of column 3 of table described in A051714/A051715.

Terms

a(0) =4a(1) =5a(2) =15a(3) =35a(4) =105a(5) =105a(6) =105a(7) =165a(8) =165a(9) =455a(10) =15015a(11) =1365a(12) =1365a(13) =255a(14) =255a(15) =11305a(16) =33915a(17) =21945a(18) =21945a(19) =345a(20) =3795a(21) =10465a(22) =31395a(23) =1365a(24) =1365a(25) =435a(26) =435a(27) =346115a(28) =1038345a(29) =55335