Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-0101-0111 pattern in any orientation.
A147205
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-0101-0111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =5a(9) =13a(10) =25a(11) =41a(12) =107a(13) =335a(14) =953a(15) =3255a(16) =14559a(17) =66659a(18) =322289a(19) =1582731a(20) =8865325a(21) =55810029
External references
- oeis: A147205