67706domain: NAppears in sequencesNumbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 20.at n=20A031608Expansion of e.g.f. 1/(1 - sinh(x))^2.at n=7A107404Distance from Fibonacci(n) to the next perfect square.at n=46A216223