a(n) = n-th partial sum of Golay-Rudin-Shapiro sequence A020985.

Terms

a(0) =1a(1) =2a(2) =3a(3) =2a(4) =3a(5) =4a(6) =3a(7) =4a(8) =5a(9) =6a(10) =7a(11) =6a(12) =5a(13) =4a(14) =5a(15) =4a(16) =5a(17) =6a(18) =7a(19) =6a(20) =7a(21) =8a(22) =7a(23) =8a(24) =7a(25) =6a(26) =5a(27) =6a(28) =7a(29) =8