6292738363domain: NAppears in sequencesa(n) = 5*a(n-1) - a(n-2), with a(0) = 1 and a(1) = 2.at n=15A002310Expansion of g.f. (x^3+x^2+2*x+1)/(x^4+5*x^2+1).at n=29A101463Values of x in the solutions to x^2 - 5xy + y^2 + 5 = 0, where 0 < x < y.at n=29A237254