Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0110-0100-1111 pattern in any orientation.
A146795
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0110-0100-1111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =3a(8) =5a(9) =15a(10) =25a(11) =43a(12) =117a(13) =383a(14) =1105a(15) =5515a(16) =16397a(17) =82031a(18) =330697a(19) =1913291a(20) =10092005a(21) =75250999
External references
- oeis: A146795