88760domain: NAppears in sequencesSum of the distances between the 2^n vertices in the De Bruijn Graphs on words of length n on alphabet {0,1}.at n=6A058052a(n) = n*(4*n^2+5*n-3)/2.at n=34A126335Numbers k such that k and k^2 use only the digits 0, 3, 6, 7 and 8.at n=10A136943a(n) = Sum_{k=1..n} (k/gcd(n, k))^4.at n=14A343514