Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1100-0110-0011 pattern in any orientation.
A147143
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1100-0110-0011 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =5a(6) =7a(7) =11a(8) =39a(9) =91a(10) =199a(11) =489a(12) =1779a(13) =6121a(14) =21635a(15) =87281a(16) =429831
External references
- oeis: A147143