179792domain: NAppears in sequencesa(n) = a(1)*a(n-1) + a(2)*a(n-2) + ...+ a(n-1)*a(1) for n >= 3, with initial terms 3,2.at n=7A025232Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 53.at n=7A031731