Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 10000-11111-00001 pattern in any orientation.
A147073
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 10000-11111-00001 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =3a(8) =11a(9) =21a(10) =39a(11) =89a(12) =219a(13) =569a(14) =1579a(15) =5069a(16) =17101a(17) =62347a(18) =244493a(19) =1058973a(20) =4994427a(21) =25066841a(22) =137507293a(23) =817420471
External references
- oeis: A147073