6690150domain: NAppears in sequencesExpansion of 1/((1-x)^5 - x^5).at n=21A049016Number of walks of length 2n+1 between two nodes at distance 3 in the cycle graph C_10.at n=11A095932a(n) = Sum_{k>=0} binomial(n,5*k+1).at n=25A133476a(n) = Sum_{k >= 0} binomial(n,5*k+4).at n=25A139761