Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0100-0100-1111-0100 pattern in any orientation.
A147039
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0100-0100-1111-0100 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =3a(6) =5a(7) =9a(8) =21a(9) =37a(10) =87a(11) =219a(12) =581a(13) =2019a(14) =6603a(15) =23569a(16) =95313
External references
- oeis: A147039