Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1111-0100-0100 pattern in any orientation.
A146826
Number of n X n binary arrays symmetric about main diagonal 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) =3a(6) =11a(7) =27a(8) =69a(9) =315a(10) =1713a(11) =11493a(12) =84155a(13) =723421a(14) =7696049a(15) =106846827a(16) =1733858135a(17) =33633104443a(18) =799782972413
External references
- oeis: A146826