220662domain: NAppears in sequencesNumber of subsets of {1,2,...,n-10} without differences equal to 2, 4, 6, 8 or 10.at n=55A224812Number of (5+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=20A252389