Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 10000-11111-10000 pattern in any orientation.
A147081
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 10000-11111-10000 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =5a(8) =11a(9) =23a(10) =38a(11) =81a(12) =220a(13) =567a(14) =1681a(15) =5209a(16) =18445a(17) =63999a(18) =259065a(19) =1109285a(20) =5269124a(21) =26433601a(22) =148185912a(23) =862407722
External references
- oeis: A147081