1181567domain: NAppears in sequencesNumber of n X 3 0..1 arrays with every element unequal to 0, 2, 3 or 6 king-move adjacent elements, with upper left element zero.at n=28A304136a(n) = n^4 + 8*n^3 + 20*n^2 + 16*n + 2.at n=31A304725