Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 11000-01111-11000 pattern in any orientation.
A147457
Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 11000-01111-11000 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) =2a(11) =1a(12) =4a(13) =1a(14) =8a(15) =3a(16) =28a(17) =9a(18) =91a(19) =19a(20) =268a(21) =53a(22) =1008a(23) =174a(24) =4754a(25) =577
External references
- oeis: A147457