Number of n X 2 arrays of occupancy after each element moves to some king-move neighbor, without 2-loops or left turns.

A221801

Number of n X 2 arrays of occupancy after each element moves to some king-move neighbor, without 2-loops or left turns.

Terms

    a(0) =0a(1) =9a(2) =56a(3) =378a(4) =2475a(5) =16256a(6) =106629a(7) =699390a(8) =4587006a(9) =30083849a(10) =197303468a(11) =1294003073a(12) =8486637160a(13) =55659061930a(14) =365036342383

External references