Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 11011-01110 pattern in any orientation.
A147227
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 11011-01110 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =2a(7) =3a(8) =6a(9) =9a(10) =16a(11) =23a(12) =72a(13) =177a(14) =631a(15) =1684a(16) =5696a(17) =15819a(18) =69884a(19) =263612a(20) =1492069a(21) =6667995a(22) =40872228a(23) =203062570a(24) =1480955534a(25) =9070964673a(26) =81908729534
External references
- oeis: A147227