Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 110-111-110 pattern in any orientation.
A146270
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 110-111-110 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =8a(7) =19a(8) =32a(9) =51a(10) =140a(11) =477a(12) =1662a(13) =6189a(14) =24619a(15) =109450a(16) =533450a(17) =2859993a(18) =16886952a(19) =110380054a(20) =797354362a(21) =6460189913a(22) =58366269898a(23) =572562441744
External references
- oeis: A146270