Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1100-0111-0100 pattern in any orientation.
A146466
Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1100-0111-0100 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) =55a(17) =55a(18) =263a(19) =263a(20) =1645a(21) =1645a(22) =13423a(23) =13423
External references
- oeis: A146466