Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 110-111-111 pattern in any orientation.
A146276
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 110-111-111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =5a(6) =11a(7) =23a(8) =41a(9) =95a(10) =251a(11) =683a(12) =2475a(13) =8891a(14) =33925a(15) =147349a(16) =637035a(17) =3134145a(18) =16878377a(19) =99607453a(20) =667424329a(21) =4848478029a(22) =38002637893a(23) =331471680853
External references
- oeis: A146276