1294921domain: NAppears in sequencesNumber of (3+2) X (n+2) 0..3 arrays with every 3 X 3 subblock row and diagonal sum equal to 0 3 5 6 or 7 and every 3 X 3 column and antidiagonal sum not equal to 0 3 5 6 or 7.at n=27A252387Constant term in the expansion of (1 + x*y + y*z + z*x + 1/(x*y*z))^n.at n=12A361673