Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 11000-01110-00011 pattern in any orientation.
A147191
Number of n X n binary arrays symmetric 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) =3a(8) =11a(9) =21a(10) =45a(11) =95a(12) =317a(13) =775a(14) =2631a(15) =8089a(16) =34521a(17) =128479a(18) =651913a(19) =2804553a(20) =16941209a(21) =86096205a(22) =609652687
External references
- oeis: A147191