Number of ways to place two non-attacking wazirs on all free n-ominoes.
A171012
Number of ways to place two non-attacking wazirs on all free n-ominoes.
Terms
- a(0) =0a(1) =0a(2) =2a(3) =14a(4) =71a(5) =341a(6) =1591a(7) =7610a(8) =35432a(9) =165209
External references
- oeis: A171012