184915domain: NAppears in sequencesNumbers k such that the period of the continued fraction for sqrt(k) contains exactly 63 ones.at n=26A031831Number of 5 X n 0..1 arrays with every element equal to 0, 1, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.at n=10A303317