Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-0111-0001 pattern in any orientation.
A146661
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-0111-0001 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =9a(6) =23a(7) =67a(8) =379a(9) =2563a(10) =18843a(11) =171357a(12) =2142397a(13) =34085501a(14) =656314291a(15) =15909337201a(16) =492190457043
External references
- oeis: A146661