Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 11100-00100-00111 pattern in any orientation.
A147249
Number of n X n binary arrays symmetric under horizontal and vertical 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) =1a(7) =1a(8) =1a(9) =1a(10) =13a(11) =13a(12) =41a(13) =41a(14) =245a(15) =245a(16) =1633a(17) =1633a(18) =20989a(19) =20989a(20) =305457a(21) =305457a(22) =6244799a(23) =6244799a(24) =168722653a(25) =168722653
External references
- oeis: A147249