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A156439
Number of n X n arrays of squares of integers, symmetric under 90 degree rotation, with all rows summing to 5.
0
2, 3, 0, 0, 480, 2400, 0, 0, 7574400, 66083040, 0, 0, 896812758240, 10058239033920, 0, 0, 374736233227188672, 5125335197750964000, 0, 0
OFFSET
4,1
CROSSREFS
Sequence in context: A240658 A342315 A063890 * A087734 A073644 A123343
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 09 2009
STATUS
approved