Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1111-0010-0010 pattern in any orientation.

A147176

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1111-0010-0010 pattern in any orientation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =5a(8) =25a(9) =49a(10) =81a(11) =173a(12) =659a(13) =1949a(14) =6591a(15) =26979a(16) =151047a(17) =720521a(18) =4123761a(19) =21126009a(20) =143739573

External references