Number of n X 4 arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, without 2-loops.

A221110

Number of n X 4 arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, without 2-loops.

Terms

    a(0) =0a(1) =7a(2) =178a(3) =3706a(4) =73267a(5) =1424745a(6) =27551817a(7) =531785885a(8) =10257442136a(9) =197807790635

External references