A156446 Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 8.

1, 2, 10, 18, 308, 1716, 83987, 644220, 42440517, 448032730, 40142592042, 617153224314, 75157230205402, 1794934830265052, 303255697073306250

Offset

2,2

Links

Table of n, a(n) for n=2..16.

Crossrefs

Sequence in context: A180591 A330083 A322951 * A032685 A085936 A226179

Adjacent sequences: A156443 A156444 A156445 * A156447 A156448 A156449

Keyword

nonn

Author

R. H. Hardin Feb 09 2009

Status

approved