A023001 interleaved with 2*A023001 and 4*A023001.

Terms

a(0) =0a(1) =0a(2) =0a(3) =1a(4) =2a(5) =4a(6) =9a(7) =18a(8) =36a(9) =73a(10) =146a(11) =292a(12) =585a(13) =1170a(14) =2340a(15) =4681a(16) =9362a(17) =18724a(18) =37449a(19) =74898a(20) =149796a(21) =299593a(22) =599186a(23) =1198372a(24) =2396745a(25) =4793490a(26) =9586980a(27) =19173961a(28) =38347922a(29) =76695844