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A156444
Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 7.
0
6, 0, 616, 635, 78688, 149480, 17605696, 69492920, 8671131376, 72256187200, 10754086795840, 162770370597240, 31157969676392800, 681286019507189376
OFFSET
4,1
CROSSREFS
Sequence in context: A294686 A179936 A219952 * A218343 A122192 A357801
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 09 2009
STATUS
approved