121753domain: NAppears in sequencesNumber of 3 X n 0..1 arrays with rows and antidiagonals unimodal and columns nondecreasing.at n=18A224147Number of 3 X n 0..1 arrays with every element equal to 0, 1, 3 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.at n=15A302428