a(n) = numerator(Sum_{j=0..n} Bernoulli(j, 1) * Bernoulli(n - j, 1)).

Terms

a(0) =1a(1) =1a(2) =7a(3) =1a(4) =-7a(5) =-1a(6) =23a(7) =1a(8) =-121a(9) =-1a(10) =481a(11) =5a(12) =-3015581a(13) =-691a(14) =67337a(15) =7a(16) =-30135767a(17) =-3617a(18) =10946836702a(19) =43867a(20) =-369658793327a(21) =-174611a(23) =854513a(25) =-236364091a(27) =8553103a(29) =-23749461029