a(n) is the denominator of x(n) = (2*x(n-1) + 1/n) mod 1, with x(0) = 0.

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =12a(5) =30a(6) =30a(7) =105a(8) =840a(9) =1260a(10) =63a(11) =693a(12) =2772a(13) =18018a(14) =18018a(15) =45045a(16) =720720a(17) =6126120a(18) =3063060a(19) =29099070a(20) =58198140a(21) =29099070a(22) =29099070a(23) =334639305a(24) =2677114440a(25) =6692786100a(26) =1673196525a(27) =5019589575a(28) =20078358300a(29) =291136195350