Numerator of 1 - A164555(n)/A027642(n).

Terms

a(0) =0a(1) =1a(2) =5a(3) =1a(4) =31a(5) =1a(6) =41a(7) =1a(8) =31a(9) =1a(10) =61a(11) =1a(12) =3421a(13) =1a(14) =-1a(15) =1a(16) =4127a(17) =1a(18) =-43069a(19) =1a(20) =174941a(21) =1a(22) =-854375a(23) =1a(24) =236366821a(25) =1a(26) =-8553097a(27) =1a(28) =23749461899a(29) =1