Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1000-1111-1000 pattern in any orientation.
A146415
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 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) =18a(9) =9a(10) =192a(11) =29a(12) =1571a(13) =137a(14) =16589a(15) =1117a(16) =263101a(17) =13601a(18) =7736259a(19) =257342a(20) =336101213a(21) =6436423a(22) =19847949792a(23) =229848194
External references
- oeis: A146415