881000domain: NAppears in sequencesNumbers k such that k and k^2 use only the digits 0, 1, 6, 7 and 8.at n=16A136876Number of (n+2) X (2+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010001.at n=14A260538