Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1000-1000-1111 pattern in any orientation.
A147097
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1000-1000-1111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =3a(8) =13a(9) =21a(10) =45a(11) =97a(12) =227a(13) =551a(14) =1339a(15) =4289a(16) =13667a(17) =51899a(18) =209203a(19) =857785a(20) =3894865a(21) =18769711a(22) =98430017a(23) =545007039
External references
- oeis: A147097