a(n) = numerator(2^n * Bernoulli(n, 1)).

Terms

a(0) =1a(1) =1a(2) =2a(3) =0a(4) =-8a(5) =0a(6) =32a(7) =0a(8) =-128a(9) =0a(10) =2560a(11) =0a(12) =-1415168a(13) =0a(14) =57344a(15) =0a(16) =-118521856a(17) =0a(18) =5749735424a(19) =0a(20) =-91546451968a(21) =0a(23) =0a(25) =0a(27) =0a(29) =0a(31) =0a(33) =0a(35) =0