Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1001-1111-1000 pattern in any orientation.
A146841
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1001-1111-1000 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =17a(9) =17a(10) =53a(11) =53a(12) =329a(13) =329a(14) =2805a(15) =2805a(16) =46829a(17) =46829a(18) =1364733a(19) =1364733a(20) =44089225a(21) =44089225
External references
- oeis: A146841