121552domain: NAppears in sequencesG.f.: x*(1-x^2)*(x^4+x^3-x^2+x+1) / (x^8-4*x^6-x^4-4*x^2+1).at n=18A005822Number of (n+1) X (1+1) 0..1 arrays with each 2 X 2 subblock having clockwise pattern 0000 0001 0011 0101 or 1111.at n=8A259517Numbers n for which A269174(sigma(n)) is equal to 2*A269174(n).at n=19A332465