a(n) = denominator(Bernoulli(n, x/2) - Bernoulli(n, x)).

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =16a(5) =96a(6) =64a(7) =384a(8) =256a(9) =2560a(10) =1024a(11) =6144a(12) =4096a(13) =860160a(14) =81920a(15) =98304a(16) =65536a(17) =1966080a(18) =1310720a(19) =55050240a(20) =7340032a(21) =346030080a(22) =20971520a(23) =125829120a(24) =16777216a(25) =9160359936a(26) =469762048a(27) =134217728a(28) =268435456a(29) =8053063680