Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 101-111-010 pattern in any orientation.
A146220
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 101-111-010 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) =34a(11) =85a(12) =281a(13) =955a(14) =3256a(15) =11436a(16) =47842a(17) =229549a(18) =1285142a(19) =7367162a(20) =46939349a(21) =319959201a(22) =2574706386a(23) =22549841306a(24) =223885431121
External references
- oeis: A146220