Number of (n+1)X3 0..3 arrays with every 2X2 subblock sum equal to some horizontal or vertical neighbor 2X2 subblock sum.

A185569

Number of (n+1)X3 0..3 arrays with every 2X2 subblock sum equal to some horizontal or vertical neighbor 2X2 subblock sum.

Terms

    a(0) =704a(1) =15776a(2) =319448a(3) =7140256a(4) =159990728a(5) =3638705368a(6) =82978157360

External references