a(2n)=A165568(n). a(2n+1)=A165563(n).

Terms

a(0) =-1a(1) =1a(2) =1a(3) =7a(4) =31a(5) =41a(6) =137a(7) =151a(8) =391a(9) =409a(10) =889a(11) =911a(12) =1751a(13) =1777a(14) =3121a(15) =3151a(16) =5167a(17) =5201a(18) =8081a(19) =8119a(20) =12079a(21) =12121a(22) =17401a(23) =17447a(24) =24311a(25) =24361a(26) =33097a(27) =33151a(28) =44071a(29) =44129