Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1101-1111 pattern in any orientation.
A146867
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1101-1111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =5a(8) =9a(9) =21a(10) =33a(11) =55a(12) =141a(13) =887a(14) =2729a(15) =13023a(16) =38545a(17) =182567a(18) =834697a(19) =7193987a(20) =40372625a(21) =350655929
External references
- oeis: A146867