Number of ways to place two non-attacking kings on all free n-ominoes.
A171010
Number of ways to place two non-attacking kings on all free n-ominoes.
Terms
- a(0) =0a(1) =0a(2) =1a(3) =7a(4) =46a(5) =240a(6) =1207a(7) =6004a(8) =28903a(9) =137996
External references
- oeis: A171010