Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 9.
A156449
Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 9.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =28a(4) =68a(5) =788a(6) =2096a(7) =74764a(8) =297215a(9) =56568904a(10) =378230514a(11) =110049447136
External references
- oeis: A156449