Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1110-0111 pattern in any orientation.
A146822
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1110-0111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =5a(5) =21a(6) =63a(7) =331a(8) =1837a(9) =11817a(10) =91941a(11) =951301a(12) =13059325a(13) =223458589a(14) =4681971763
External references
- oeis: A146822