1411789domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of nX2 0..1 arrays with every element unequal to 1, 2, 3 or 5 king-move adjacent elements, with upper left element zero.at n=13A304013G.f. A(x) satisfies A(x) = B(x*A(x)) / (1 - x)^3, where B(x) is the g.f. of A002293.at n=7A381947Prime numbersat n=107934