Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 01000-11111-00010 pattern in any orientation.
A147018
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 01000-11111-00010 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =5a(5) =9a(6) =21a(7) =35a(8) =177a(9) =589a(10) =4235a(11) =15969a(12) =164553a(13) =879607a(14) =12456629a(15) =97189937a(16) =1947709409a(17) =20669429409
External references
- oeis: A147018