41464domain: NAppears in sequencesDiagonal sums of A004248.at n=15A104872Number of (1+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 2 3 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 2 3 4 6 or 7.at n=9A252408a(n) = Sum_{k=0..n} k^(2 * (n-k) + 1).at n=7A359660