Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1100-0111-0100 pattern in any orientation.

A147160

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1100-0111-0100 pattern in any orientation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =9a(8) =25a(9) =53a(10) =97a(11) =275a(12) =939a(13) =2977a(14) =11455a(15) =54387a(16) =273381a(17) =1565737a(18) =8740687a(19) =56416565a(20) =398132663

External references