92228domain: NAppears in sequencesNumber of (n+2)X(1+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 1 3 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 1 3 6 or 7.at n=10A252150G.f. A(x) satisfies: A( A(x)^2 - A(x)^3 ) = x*A(x).at n=13A268655