111574domain: NAppears in sequencesNumber of nX3 0..1 arrays with every element equal to 0, 1, 2, 4, 6 or 7 king-move adjacent elements, with upper left element zero.at n=18A299182Number of (binary) heaps of length n-k whose element set equals [k], where k is chosen so as to maximize this number.at n=16A373897