Number of n X 2 arrays of occupancy after each element moves to some horizontal or vertical neighbor but without 2-loops.

A217340

Number of n X 2 arrays of occupancy after each element moves to some horizontal or vertical neighbor but without 2-loops.

Terms

    a(0) =0a(1) =1a(2) =7a(3) =38a(4) =190a(5) =918a(6) =4367a(7) =20623a(8) =97052a(9) =455960a(10) =2140404a(11) =10043697a(12) =47120343a(13) =221046178a(14) =1036902766a(15) =4863888050a(16) =22815211759a(17) =107019570351a(18) =501996648392

External references