3266080domain: NAppears in sequencesNumber of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and column sum not 2 4 5 or 7 and every diagonal and antidiagonal sum 2 4 5 or 7.at n=12A251870Numbers k such that 4*k + {1, 3, 7, 9, 13, 19} are all prime.at n=12A254288