Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 11101-10111 pattern in any orientation.
A147491
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 11101-10111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =1a(9) =1a(10) =25a(11) =25a(12) =137a(13) =137a(14) =521a(15) =521a(16) =6501a(17) =6501a(18) =70441a(19) =70441a(20) =694381a(21) =694381a(22) =20946853a(23) =20946853a(24) =656540805
External references
- oeis: A147491