119694domain: NAppears in sequencesNumber of n X n 0..1 arrays with every element equal to 0, 1, 2, 5 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=7A301319G.f. A(x) satisfies: A(x) = 1 + x * A(x)^3 / (1 - 3 * x).at n=7A349531