Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1000-1000-1111-0001 pattern in any orientation.
A147270
Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1000-1000-1111-0001 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =183a(9) =351a(10) =3185a(11) =7397a(12) =80251a(13) =204181a(14) =3751343a(15) =10958987a(16) =859595115a(17) =3088432553a(18) =597934255811
External references
- oeis: A147270