Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-0111-0001-0001 pattern in any orientation.
A147288
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-0111-0001-0001 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =5a(5) =13a(6) =29a(7) =101a(8) =617a(9) =3357a(10) =20865a(11) =140793a(12) =1290919a(13) =15614005a(14) =229745285a(15) =3898534669
External references
- oeis: A147288