669526domain: NAppears in sequencesNumber of numbers == 0 (mod 3) in range 2^n to 2^(n+1) with odd number of 1's in binary expansion.at n=21A000773Generalized Poly-Bernoulli numbers.at n=10A081674Expansion of (1-x)^4/((1-x)^6 - x^6).at n=21A119336