Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1111-0100-0100 pattern in any orientation.
A146827
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1111-0100-0100 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =5a(9) =9a(10) =21a(11) =33a(12) =75a(13) =191a(14) =769a(15) =2241a(16) =10975a(17) =33339a(18) =159399a(19) =627233a(20) =4142099a(21) =21519301
External references
- oeis: A146827