Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0100-0111-0001 pattern in any orientation.
A147199
Number of n X n binary arrays symmetric 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) =9a(9) =25a(10) =37a(11) =77a(12) =207a(13) =663a(14) =1517a(15) =4967a(16) =16733a(17) =80643a(18) =308521a(19) =1536069a(20) =6622503a(21) =39983439a(22) =198749745a(23) =1357116341
External references
- oeis: A147199