49900domain: NAppears in sequencesNumber of balanced numbers > 2^(n-1) and <= 2^n.at n=43A078555Numbers n such that the decimal representation of n is contained as substring in that of the n-th pentagonal number.at n=16A179782a(n) = 4*n*(21*n - 26).at n=25A263229a(n) = Sum_{k=0..n} binomial(n+6*k+6,k).at n=4A390390