207896domain: NAppears in sequencesa(n+1) = Sum_{k=0..floor(3*n/5)} a(k) * a(n-k).at n=18A030038Number of nX3 0..1 arrays with every element unequal to 1, 2, 3, 6 or 7 king-move adjacent elements, with upper left element zero.at n=11A305084