Numerators of column 2 of table described in A051714/A051715.

Terms

a(0) =1a(1) =1a(2) =3a(3) =1a(4) =-3a(5) =-1a(6) =1a(7) =1a(8) =1a(9) =-5a(10) =-1017a(11) =691a(12) =601a(13) =-7a(14) =-809a(15) =3617a(16) =922191a(17) =-43867a(18) =-6132631a(19) =174611a(20) =12988703a(21) =-854513a(22) =-1552922421a(23) =236364091a(24) =1139644561a(25) =-8553103a(26) =-7089687053a(27) =23749461029