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A156446
Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 8.
0
1, 2, 10, 18, 308, 1716, 83987, 644220, 42440517, 448032730, 40142592042, 617153224314, 75157230205402, 1794934830265052, 303255697073306250
OFFSET
2,2
CROSSREFS
Sequence in context: A180591 A330083 A322951 * A032685 A085936 A226179
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 09 2009
STATUS
approved