Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1001-1111 pattern in any orientation.
A146624
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1001-1111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =7a(7) =15a(8) =27a(9) =59a(10) =155a(11) =405a(12) =1359a(13) =4729a(14) =17093a(15) =68787a(16) =322325a(17) =1555247a(18) =8826433a(19) =52320689a(20) =346500913a(21) =2442891583a(22) =19699289407a(23) =167408986709
External references
- oeis: A146624