Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1000-1000-1111-1000 pattern in any orientation.
A147124
Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1000-1000-1111-1000 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =183a(9) =351a(10) =3263a(11) =7493a(12) =94421a(13) =245945a(14) =5221197a(15) =15740513a(16) =1251933355a(17) =4637231205a(18) =678331261037
External references
- oeis: A147124