2309385domain: NAppears in sequencesNumber of walks of length n between two nodes at distance 3 in the cycle graph C_7.at n=21A095308Coefficients of A(x), which satisfies: A(x) = 1 + x*A(x)^3 + x^2*A(x)^6.at n=9A255673a(n) = Sum_{k=0..floor(n/7)} binomial(n,7*k).at n=24A306852a(n) = Sum_{k=0..n} binomial(2*n,7*k).at n=12A387845