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A156473
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Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 20.
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0
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2, 0, 32, 75, 3154, 31638, 4561976, 75335814, 23873894500, 748560286220, 449126699046010
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OFFSET
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2,1
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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