Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 110-111-001 pattern in any orientation.
A146236
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 110-111-001 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =9a(8) =17a(9) =33a(10) =89a(11) =333a(12) =849a(13) =5379a(14) =20923a(15) =147329a(16) =704405a(17) =5858399a(18) =36340527a(19) =403495741a(20) =3132269377a(21) =47135996775a(22) =474369570793
External references
- oeis: A146236