First column of A174295.

Terms

a(0) =1a(1) =-1a(2) =-1a(3) =0a(4) =-1a(5) =1a(6) =-3a(7) =6a(8) =-15a(9) =36a(10) =-91a(11) =232a(12) =-603a(13) =1585a(14) =-4213a(15) =11298a(16) =-30537a(17) =83097a(18) =-227475a(19) =625992a(20) =-1730787a(21) =4805595a(22) =-13393689a(23) =37458330a(24) =-105089229a(25) =295673994a(26) =-834086421a(27) =2358641376a(28) =-6684761125a(29) =18985057351