254122

Appears in sequences

• A014486-encoding of symmetric binary trees.at n=23A083941
• Number of primes whose binary expansion begins '11' (A080166) in range ]2^n,2^(n+1)].at n=22A095766
• a(n) = Sum_{j=0..n} n^wt(j), where wt = A000120.at n=21A361257