Denominators of column 2 of table described in A051714/A051715.

Terms

a(0) =3a(1) =4a(2) =20a(3) =20a(4) =140a(5) =28a(6) =140a(7) =20a(8) =220a(9) =44a(10) =20020a(11) =1820a(12) =1820a(13) =4a(14) =340a(15) =340a(16) =45220a(17) =532a(18) =29260a(19) =220a(20) =5060a(21) =92a(22) =41860a(23) =1820a(24) =1820a(25) =4a(26) =580a(27) =580a(28) =1384460a(29) =9548