Partial sums of floor(2^n/7).

Terms

a(0) =0a(1) =0a(2) =0a(3) =1a(4) =3a(5) =7a(6) =16a(7) =34a(8) =70a(9) =143a(10) =289a(11) =581a(12) =1166a(13) =2336a(14) =4676a(15) =9357a(16) =18719a(17) =37443a(18) =74892a(19) =149790a(20) =299586a(21) =599179a(22) =1198365a(23) =2396737a(24) =4793482a(25) =9586972a(26) =19173952a(27) =38347913a(28) =76695835a(29) =153391679