680800domain: NAppears in sequencesNumbers k such that k and k^2 use only the digits 0, 3, 4, 6 and 8.at n=25A136931Number of integers in n-th generation of tree T(5/2) defined in Comments.at n=35A274153a(n) = Sum_{k=0..floor(3*n/8)} binomial(k+2,2) * binomial(k,3*n-8*k).at n=42A392316