Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 0010-1110-0111-0100 pattern in any orientation.
A146902
Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 0010-1110-0111-0100 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =21a(9) =33a(10) =169a(11) =271a(12) =1427a(13) =2719a(14) =19923a(15) =41145a(16) =1164335a(17) =2872687a(18) =96665317a(19) =273847235a(20) =9740767609a(21) =31500367345
External references
- oeis: A146902