Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-0111-0011 pattern in any orientation.

A147211

Number of n X n binary arrays symmetric under horizontal and vertical reflection 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) =1a(5) =1a(6) =1a(7) =1a(8) =17a(9) =17a(10) =57a(11) =57a(12) =405a(13) =405a(14) =4805a(15) =4805a(16) =131407a(17) =131407a(18) =3796773a(19) =3796773a(20) =159419173a(21) =159419173

External references