Number of fixed n-celled polyknights.

Terms

a(0) =1a(1) =4a(2) =28a(3) =234a(4) =2162a(5) =20972a(6) =209608a(7) =2135572a(8) =22049959a(9) =229939414a(10) =2416816416a(11) =25569786440a(12) =272057195864