Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-1111-1000 pattern in any orientation.
A146718
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-1111-1000 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =7a(9) =13a(10) =27a(11) =41a(12) =107a(13) =327a(14) =1681a(15) =5451a(16) =24597a(17) =80545a(18) =454313a(19) =2226033a(20) =18080203a(21) =106915629
External references
- oeis: A146718