Binary XOR of 3^k as k varies from 0 to n.

Terms

a(0) =1a(1) =2a(2) =11a(3) =16a(4) =65a(5) =178a(6) =619a(7) =2784a(8) =4929a(9) =24482a(10) =47371a(11) =133872a(12) =659713a(13) =1196754a(14) =5945771a(15) =8408000a(16) =34643073a(17) =94509378a(18) =313886731a(19) =1475558352a(20) =2552700993a(21) =12739900146a(22) =24581737195a(23) =70102639264a(24) =350315469377a(25) =639249412322