Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1000-1000-1000-1111 pattern in any orientation.
A147093
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1000-1000-1000-1111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =5a(9) =5a(10) =19a(11) =19a(12) =87a(13) =87a(14) =337a(15) =337a(16) =1993a(17) =1993a(18) =25339a(19) =25339a(20) =376795a(21) =376795a(22) =8378039a(23) =8378039a(24) =203827787a(25) =203827787
External references
- oeis: A147093