Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1100-0100-0111-0001 pattern in any orientation.
A147198
Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1100-0100-0111-0001 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) =13a(13) =13a(14) =27a(15) =27a(16) =85a(17) =85a(18) =297a(19) =297a(20) =1599a(21) =1599a(22) =7901a(23) =7901a(24) =42229a(25) =42229a(26) =268975a(27) =268975
External references
- oeis: A147198