Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1111-0001 pattern in any orientation.
A146608
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1111-0001 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =3a(7) =9a(8) =21a(9) =41a(10) =85a(11) =247a(12) =661a(13) =2133a(14) =7669a(15) =30043a(16) =131633a(17) =623713a(18) =3176911a(19) =18218893a(20) =109622217a(21) =754540743a(22) =5491953507a(23) =45422445535
External references
- oeis: A146608