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A223405
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Number of nX3 0..3 arrays with all rows and columns having a nonnegative second derivative in a quadratic least squares fit, with one and two element arrays taken as having a zero second derivative
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0
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36, 1296, 11254, 449810, 13266784, 417523315, 14781272688, 521262156765, 17822960179390, 683066414115964, 23438466168324477
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