129009355423domain: NAppears in sequencesExpansion of (1+31*x-2*x^2-2*x^3)/(1-16*x^2+x^4).at n=17A077397y-values in the solution to x^2 - 7*y^2 = -3.at n=19A202638Denominators of the continued fraction convergents to sqrt(7)/2.at n=18A294973