Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1000-1001-1111 pattern in any orientation.
A147133
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1000-1001-1111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =17a(9) =17a(10) =57a(11) =57a(12) =277a(13) =277a(14) =2295a(15) =2295a(16) =39117a(17) =39117a(18) =1059135a(19) =1059135a(20) =28274373
External references
- oeis: A147133