Number of n X n arrays of squares of integers, symmetric under 90 degree rotation, with all rows summing to 28.

A156488

Number of n X n arrays of squares of integers, symmetric under 90 degree rotation, with all rows summing to 28.

Terms

    a(0) =6a(1) =0a(2) =78a(3) =163a(4) =58704a(5) =590400a(6) =202480300a(7) =9256081380

External references