Number of (n+1)X4 0..2 arrays with every 2X2 subblock trace equal to exactly one or two horizontal and vertical neighbor 2X2 subblock traces.

A187134

Number of (n+1)X4 0..2 arrays with every 2X2 subblock trace equal to exactly one or two horizontal and vertical neighbor 2X2 subblock traces.

Terms

    a(0) =405a(1) =19062a(2) =267840a(3) =5755698a(4) =99203418a(5) =1921749372a(6) =34994620836a(7) =658156407930

External references