a(n) = a(n-1) + c(n-1) for n >= 2, a( ) increasing, given a(1)=4; where c( ) is complement of a( ).

Terms

a(0) =4a(1) =5a(2) =7a(3) =10a(4) =16a(5) =24a(6) =33a(7) =44a(8) =56a(9) =69a(10) =83a(11) =98a(12) =115a(13) =133a(14) =152a(15) =172a(16) =193a(17) =215a(18) =238a(19) =263a(20) =289a(21) =316a(22) =344a(23) =373a(24) =403a(25) =434a(26) =466a(27) =500a(28) =535a(29) =571