522496domain: NAppears in sequencesa(n) = n^2*(n^3-n+2)/2.at n=16A101377Arises in enumerating Huffman codes, compact trees, and sums of unit fractions.at n=21A194633Number of nX5 0..1 arrays with every element equal to 0, 1, 3, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero.at n=10A300086