Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0111-1100-0111 pattern in any orientation.

A147374

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0111-1100-0111 pattern in any orientation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =5a(8) =20a(9) =29a(10) =50a(11) =83a(12) =280a(13) =625a(14) =2242a(15) =6281a(16) =30765a(17) =93559a(18) =481174a(19) =1596542a(20) =9219820a(21) =37372099a(22) =265178423a(23) =1263828408a(24) =10782899831

External references