63871domain: NAppears in sequencesNumber of nX3 0..1 arrays with every element unequal to 0, 1, 2, 4 or 8 king-move adjacent elements, with upper left element zero.at n=13A305240G.f. satisfies A(x) = 1 + x*A(x)*(1 + x^4*A(x)^3).at n=18A365079