Number of nX3 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor, with every occupancy equal to zero or two.

A221404

Number of nX3 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor, with every occupancy equal to zero or two.

Terms

    a(0) =0a(1) =16a(2) =0a(3) =436a(4) =0a(5) =12668a(6) =0a(7) =368268a(8) =0a(9) =10705360a(10) =0a(11) =311197280a(12) =0a(13) =9046269888a(14) =0a(15) =262968117056a(16) =0a(18) =0a(20) =0a(22) =0a(24) =0a(26) =0a(28) =0

External references