Number of n X n arrays of squares of integers with every 3X3 subblock summing to 21.

A159223

Number of n X n arrays of squares of integers with every 3X3 subblock summing to 21.

Terms

    a(0) =7182a(1) =81970a(2) =467006a(3) =1871442a(4) =9915518a(5) =40057258a(6) =143026182a(7) =684920266a(8) =2780241662a(9) =10567815570

External references