102832domain: NAppears in sequencesG.f. satisfies: A(x)^2 = A(x^2)^2 + 4*x.at n=19A223142Number of (1+2) X (n+2) 0..3 arrays with every 3 X 3 subblock row and diagonal sum equal to 0 3 4 6 or 7 and every 3 X 3 column and antidiagonal sum not equal to 0 3 4 6 or 7.at n=8A252641