Number of n X n nonnegative integer arrays with every 2 X 2 subblock summing to 4.

A145014

Number of n X n nonnegative integer arrays with every 2 X 2 subblock summing to 4.

Terms

    a(0) =35a(1) =259a(2) =1059a(3) =5395a(4) =19091a(5) =84499a(6) =284451a(7) =1180243a(8) =3922835

External references