Number of n X 2 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, with no 2-loops and with no occupancy greater than 2.

A221357

Number of n X 2 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, with no 2-loops and with no occupancy greater than 2.

Terms

    a(0) =0a(1) =5a(2) =39a(3) =292a(4) =2088a(5) =14799a(6) =104532a(7) =737498a(8) =5200799a(9) =36668393a(10) =258507703a(11) =1822366939a(12) =12846614967a(13) =90560097250a(14) =638385027225

External references