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A156431
Number of nXn arrays of squares of integers, symmetric under 90 degree rotation, with all rows summing to 2.
+0
1
1, 0, 2, 0, 12, 0, 90, 0, 810, 0, 8940, 0, 116760, 0, 1756860, 0, 29933820, 0, 569744280, 0, 11981526480, 0, 275893362360, 0, 6903968231160, 0, 186558764792400, 0, 5413973807642400
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Maintained by
N. J. A. Sloane
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njas@research.att.com
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Last modified December 7 23:50 EST 2009. Contains 170430 sequences.
AT&T Labs Research
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