Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0100-0100-1111-0010 pattern in any orientation.
A147033
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0100-0100-1111-0010 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =5a(8) =31a(9) =53a(10) =91a(11) =191a(12) =751a(13) =2485a(14) =12125a(15) =48629a(16) =262319a(17) =1174125a(18) =7756611a(19) =44436085a(20) =360750867a(21) =2552407571
External references
- oeis: A147033