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A156458
Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 13.
0
2, 6, 68, 876, 43300, 3026820, 558858552, 474109634808, 1011861877473980, 3520221010293816000
OFFSET
2,1
CROSSREFS
Sequence in context: A087331 A097419 A219037 * A244494 A136268 A030242
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 09 2009
STATUS
approved