Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1000-1100-0111-0010 pattern in any orientation.
A147152
Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1000-1100-0111-0010 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) =1a(11) =1a(12) =5a(13) =5a(14) =15a(15) =15a(16) =33a(17) =33a(18) =101a(19) =101a(20) =729a(21) =729a(22) =5159
External references
- oeis: A147152