a(n) = denominator(Bernoulli(prime(n) - 1))/prime(n).

Terms

a(0) =1a(1) =2a(2) =6a(3) =6a(4) =6a(5) =210a(6) =30a(7) =42a(8) =6a(9) =30a(10) =462a(11) =51870a(12) =330a(13) =42a(14) =6a(15) =30a(16) =6a(17) =930930a(18) =966a(19) =66a(20) =1919190a(21) =42a(22) =6a(23) =690a(24) =46410a(25) =330a(26) =42a(27) =6a(28) =1919190a(29) =14790