278828domain: NAppears in sequencesa(n) = 576*n^2 + 2*n.at n=21A158369Number of ways to place 4 nonattacking zebras on a 4 X n board.at n=13A172222Numbers k such that k^2 XOR (k+1)^2 is a square, and k^2 XOR (k-1)^2 is a square, where XOR is the bitwise logical XOR operator.at n=11A224242