862400domain: NAppears in sequencesa(n) = (1/n) * Sum_{d|n} moebius(n/d) * A002203(d)^2, where A002203 is the companion Pell numbers.at n=8A212443The continued fraction of the positive constant r < sqrt(3) such that the partial quotients equal the integer floor of the powers of r.at n=26A227232