12395593988domain: NAppears in sequencesExpansion of (1+2*x)/(1-6*x+x^2).at n=13A054488Combined Diophantine Chebyshev sequences A054488 and A077413.at n=26A077241a(2n) = -A106328(n), a(2n+1) = A054488(n).at n=27A108931