Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1100-0110-0011 pattern in any orientation.
A147142
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1100-0110-0011 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =3a(4) =7a(5) =17a(6) =39a(7) =127a(8) =681a(9) =3913a(10) =21369a(11) =147701a(12) =1344439a(13) =15252227a(14) =199338371a(15) =3018576265a(16) =55990200331
External references
- oeis: A147142