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A156438
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Number of nXn arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 5.
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0
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2, 0, 22, 7, 232, 270, 9312, 40416, 1578064, 10491480, 534495232, 4186295040, 266388662656, 2380048630848, 182963339479264, 1839487795001024, 166774503916789696, 1865501254974930048, 195842622547532763968
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