Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0110-1111-0100 pattern in any orientation.
A146590
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0110-1111-0100 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =5a(8) =13a(9) =25a(10) =41a(11) =73a(12) =405a(13) =2087a(14) =9095a(15) =31781a(16) =109905a(17) =706437a(18) =6193961a(19) =52066515a(20) =395176419a(21) =2801856537a(22) =27230658787
External references
- oeis: A146590