Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 5.
A156438
Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 5.
Terms
- a(0) =2a(1) =0a(2) =22a(3) =7a(4) =232a(5) =270a(6) =9312a(7) =40416a(8) =1578064a(9) =10491480a(10) =534495232a(11) =4186295040a(12) =266388662656
External references
- oeis: A156438