3532004domain: NAppears in sequencesEight white kings and one red king on a 3 X 3 chessboard. G.f.: 1/(1-3*x-5*x^2+4*x^3).at n=11A179610Number of nX3 0..1 arrays with each 1 horizontally or vertically adjacent to 2 or 4 1s.at n=21A295200