Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 110-111-110 pattern in any orientation.
A146268
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 110-111-110 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =2a(7) =5a(8) =10a(9) =17a(10) =30a(11) =77a(12) =254a(13) =873a(14) =2865a(15) =9282a(16) =36476a(17) =176379a(18) =950600a(19) =5334620a(20) =30998066a(21) =200015663a(22) =1516056134a(23) =12927161092a(24) =120013319909
External references
- oeis: A146268