Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 11011-01110-00100 pattern in any orientation.
A147487
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 11011-01110-00100 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =4a(7) =7a(8) =13a(9) =21a(10) =47a(11) =71a(12) =266a(13) =697a(14) =2575a(15) =7222a(16) =30644a(17) =93493a(18) =472633a(19) =1837587a(20) =10941522a(21) =49363521a(22) =346195883a(23) =1801870833
External references
- oeis: A147487