Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 0100-0100-1111-0100 pattern in any orientation.
A147040
Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 0100-0100-1111-0100 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =3a(9) =3a(10) =5a(11) =5a(12) =9a(13) =9a(14) =21a(15) =21a(16) =69a(17) =69a(18) =305a(19) =305a(20) =1333a(21) =1333a(22) =6087a(23) =6087a(24) =37147a(25) =37147a(26) =280959a(27) =280959
External references
- oeis: A147040