Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-0111-0011 pattern in any orientation.

A147212

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-0111-0011 pattern in any orientation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =9a(6) =23a(7) =55a(8) =315a(9) =2117a(10) =14227a(11) =107639a(12) =1242577a(13) =18337443a(14) =306941589a(15) =6236872411a(16) =166949397689

External references