Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1100-0110-0011 pattern in any orientation.
A147146
Number of n X n binary arrays symmetric under 180 degree rotation 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) =9a(6) =19a(7) =67a(8) =271a(9) =1339a(10) =7503a(11) =48863a(12) =386667a(13) =3842993a(14) =45897369a(15) =657696677
External references
- oeis: A147146