Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1111-1000 pattern in any orientation.
A146417
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1111-1000 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =4a(9) =7a(10) =14a(11) =21a(12) =51a(13) =123a(14) =453a(15) =1219a(16) =4641a(17) =13599a(18) =63683a(19) =242234a(20) =1440301a(21) =6546459a(22) =44699492a(23) =239296946a(24) =1977082524a(25) =12922743339a(26) =130202512826
External references
- oeis: A146417