58195968domain: NAppears in sequences(n^3+n)*8^n.at n=5A128048Number of defective 4-colorings of an n X 2 0..3 array connected horizontally, antidiagonally and vertically with exactly one mistake, and colors introduced in row-major 0..3 order.at n=11A229473Number of permutations of [n] avoiding {3412, 3421, 1324}.at n=19A294802