Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1101-0111 pattern in any orientation.
A147168
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1101-0111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =3a(7) =13a(8) =37a(9) =67a(10) =147a(11) =499a(12) =1519a(13) =5231a(14) =22885a(15) =101333a(16) =548323a(17) =3012179a(18) =18194005a(19) =121163279a(20) =875290875
External references
- oeis: A147168