Lengths of bit runs in A123504.

Terms

a(0) =1a(1) =2a(2) =1a(3) =2a(4) =2a(5) =2a(6) =3a(7) =3a(8) =5a(9) =6a(10) =7a(11) =8a(12) =11a(13) =14a(14) =17a(15) =21a(16) =26a(17) =34a(18) =41a(19) =51a(20) =65a(21) =80a(22) =101a(23) =125a(24) =157a(25) =196a(26) =245a(27) =305a(28) =381a(29) =477