a(n) is the numerator of 1 - Sum_{i=1..n} Bernoulli(i).

Terms

a(0) =1a(1) =3a(2) =4a(3) =4a(4) =41a(5) =41a(6) =47a(7) =47a(8) =289a(9) =289a(10) =1502a(11) =1502a(12) =15551a(13) =15551a(14) =5809a(15) =5809a(16) =3818123a(17) =3818123a(18) =-76776508a(19) =-76776508a(20) =934336415a(21) =934336415a(22) =-127396984577a(23) =-127396984577