Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1001-1111-1000 pattern in any orientation.
A146845
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1001-1111-1000 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =5a(7) =13a(8) =35a(9) =61a(10) =141a(11) =427a(12) =1351a(13) =4209a(14) =19211a(15) =75163a(16) =402147a(17) =1986547a(18) =12595631a(19) =74795099a(20) =557304499
External references
- oeis: A146845