Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 11000-01110-00011 pattern in any orientation.
A147190
Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 11000-01110-00011 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) =3a(13) =3a(14) =7a(15) =7a(16) =15a(17) =15a(18) =41a(19) =41a(20) =163a(21) =163a(22) =697a(23) =697a(24) =3471a(25) =3471a(26) =20005a(27) =20005
External references
- oeis: A147190