245349domain: NAppears in sequencesNumbers k such that sigma(k) = sigma(k+13).at n=24A015883Number of n X 3 nonnegative integer arrays with upper left 0 and every value within 3 of its king move distance from the upper left and every value increasing by 0 or 1 with every step right, diagonally se or down.at n=19A252933