61712891904domain: NAppears in sequencesExpansion of (1-4*x)/(1-4*x-4*x^2).at n=17A094013Expansion of 4*x/(1 - 4*x - 4*x^2).at n=16A106568p-INVERT of (1,1,1,1,1,...), where p(S) = 1 - 6 S + S^2.at n=12A291018