Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 01000-11100-00111-00010 pattern in any orientation.
A147335
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 01000-11100-00111-00010 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) =3a(10) =7a(11) =13a(12) =21a(13) =43a(14) =105a(15) =255a(16) =713a(17) =2327a(18) =7879a(19) =28233a(20) =105483a(21) =441751a(22) =1976665a(23) =9809483a(24) =52365589a(25) =307831711
External references
- oeis: A147335