Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1111-0101 pattern in any orientation.
A147183
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1111-0101 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) =69a(10) =153a(11) =515a(12) =1541a(13) =5473a(14) =24829a(15) =107075a(16) =576645a(17) =3229459a(18) =20010951a(19) =136930705a(20) =1005926097
External references
- oeis: A147183