42823domain: NAppears in sequencesa(n) = 7^n mod 6^n.at n=9A139786Numbers that begin a run of an odd number of consecutive integers whose cubes sum to a square.at n=16A253679Largest number of maximum matchings in a tree of n vertices.at n=33A333347Coefficient of x^n in the expansion of 1 / (1-x-x^4)^n.at n=9A383481