Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 10000-11100-00111-00001 pattern in any orientation.
A147378
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 10000-11100-00111-00001 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =1a(9) =1a(10) =9a(11) =9a(12) =29a(13) =29a(14) =109a(15) =109a(16) =573a(17) =573a(18) =4463a(19) =4463a(20) =53751a(21) =53751a(22) =903115a(23) =903115a(24) =18601177
External references
- oeis: A147378