Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 10000-11111-10000 pattern in any orientation.
A147080
Number of n X n binary arrays symmetric about the diagonal and 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) =1a(8) =1a(9) =1a(10) =2a(11) =1a(12) =4a(13) =1a(14) =9a(15) =3a(16) =31a(17) =9a(18) =107a(19) =21a(20) =322a(21) =61a(22) =1322a(23) =210a(24) =6485a(25) =735a(26) =37564
External references
- oeis: A147080