Unique sequence a of 1's and 2's such that a(1) = 2 and r(r(a)) = a != r(a), where for any sequence s, r(s) is the sequence of lengths of runs of same symbols in s; r(a) is sequence A025142.
A025143
Unique sequence a of 1's and 2's such that a(1) = 2 and r(r(a)) = a != r(a), where for any sequence s, r(s) is the sequence of lengths of runs of same symbols in s; r(a) is sequence A025142.
Terms
- a(0) =2a(1) =1a(2) =2a(3) =2a(4) =1a(5) =2a(6) =1a(7) =1a(8) =2a(9) =2a(10) =1a(11) =2a(12) =2a(13) =1a(14) =1a(15) =2a(16) =1a(17) =1a(18) =2a(19) =1a(20) =2a(21) =2a(22) =1a(23) =1a(24) =2a(25) =1a(26) =1a(27) =2a(28) =2a(29) =1
External references
- oeis: A025143