Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-0111-0110 pattern in any orientation.
A146668
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-0111-0110 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =17a(9) =17a(10) =49a(11) =49a(12) =253a(13) =253a(14) =3643a(15) =3643a(16) =105629a(17) =105629a(18) =2607651a(19) =2607651a(20) =96901053a(21) =96901053
External references
- oeis: A146668