27215domain: NAppears in sequencesNumber of (n+2) X (1+2) 0..3 arrays with every 3 X 3 subblock row and column sum not equal to 0 2 4 6 or 7 and every 3 X 3 diagonal and antidiagonal sum equal to 0 2 4 6 or 7.at n=11A252516Numbers k such that k and k+2 are both A000120-perfect numbers (A175522).at n=31A360639