Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-1111 pattern in any orientation.
A146228
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-1111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =3a(7) =7a(8) =15a(9) =27a(10) =53a(11) =167a(12) =715a(13) =3083a(14) =12351a(15) =50227a(16) =261707a(17) =1665665a(18) =12424027a(19) =97246107a(20) =810664323a(21) =7548517875a(22) =83664650731
External references
- oeis: A146228