Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 11100-00100-00111 pattern in any orientation.
A147248
Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 11100-00100-00111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =7a(7) =9a(8) =31a(9) =55a(10) =549a(11) =1047a(12) =10041a(13) =21681a(14) =484881a(15) =1255593a(16) =40179283a(17) =122480813a(18) =7136007271a(19) =25526356825
External references
- oeis: A147248