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A223403
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Number of nX1 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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1
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4, 16, 36, 150, 558, 2126, 8480, 33639, 131920, 540025, 2122564, 8415455, 33814594, 135946810, 537839881, 2157395672, 8623989781, 34438483139, 137851777060, 551209368188, 2200738232246, 8832752603844, 35249999364267, 140816183400831
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