Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1110-0111-0001 pattern in any orientation.
A147401
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1110-0111-0001 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =1a(9) =5a(10) =9a(11) =17a(12) =35a(13) =101a(14) =227a(15) =539a(16) =1279a(17) =5573a(18) =17447a(19) =78819a(20) =285189a(21) =1548177a(22) =6812379a(23) =38874621a(24) =188648393a(25) =1338014585
External references
- oeis: A147401