Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-1111-0010 pattern in any orientation.
A146702
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-1111-0010 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =3a(8) =9a(9) =19a(10) =33a(11) =65a(12) =197a(13) =769a(14) =3257a(15) =13441a(16) =53529a(17) =253559a(18) =1417627a(19) =9502081a(20) =68675873a(21) =543081895a(22) =4543747499
External references
- oeis: A146702