Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1010-1111-0010 pattern in any orientation.
A146631
Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1010-1111-0010 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) =7a(13) =7a(14) =21a(15) =21a(16) =47a(17) =47a(18) =215a(19) =215a(20) =1109a(21) =1109a(22) =8005
External references
- oeis: A146631