Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1100-0111-0001 pattern in any orientation.
A147279
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1100-0111-0001 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) =9a(10) =17a(11) =33a(12) =105a(13) =379a(14) =919a(15) =2871a(16) =9565a(17) =62893a(18) =248053a(19) =1633141a(20) =8782131a(21) =72370235
External references
- oeis: A147279