Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-1111-1100 pattern in any orientation.

A147480

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-1111-1100 pattern in any orientation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =9a(6) =21a(7) =73a(8) =310a(9) =1107a(10) =5232a(11) =33319a(12) =240772a(13) =2106289a(14) =21011261a(15) =262231181a(16) =3633528079a(17) =62517538899

External references