Length of n-th run of digit 1 in A031219.

Terms

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