Numbers of form 4^(3*k+l+1)/9 - 4^l/9 - 1/3 or 2*4^(3*k+l+2)/9 - 2*4^l/9 - 1/3, k,l>=0.

Terms

a(0) =0a(1) =1a(2) =3a(3) =5a(4) =13a(5) =21a(6) =28a(7) =53a(8) =85a(9) =113a(10) =213a(11) =227a(12) =341a(13) =453a(14) =853a(15) =909a(16) =1365a(17) =1813a(18) =1820a(19) =3413a(20) =3637a(21) =5461a(22) =7253a(23) =7281a(24) =13653a(25) =14549a(26) =14563a(27) =21845a(28) =29013a(29) =29125