232978

Appears in sequences

• Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 01110-11111 pattern in any orientation.at n=19A147364
• Number of (n+2)X(1+2) 0..3 arrays with every 3X3 subblock row and column sum nonprime and every diagonal and antidiagonal sum prime.at n=15A251838