Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-1111-0100-0100 pattern in any orientation.
A147474
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-1111-0100-0100 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =3a(6) =11a(7) =35a(8) =119a(9) =483a(10) =1553a(11) =7807a(12) =47813a(13) =363745a(14) =2696139
External references
- oeis: A147474