Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 11000-01111-11000 pattern in any orientation.
A147456
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 11000-01111-11000 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) =6a(11) =11a(12) =18a(13) =27a(14) =52a(15) =137a(16) =404a(17) =1237a(18) =3559a(19) =10401a(20) =31124a(21) =115055a(22) =457260a(23) =2084424a(24) =9632056
External references
- oeis: A147456