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A223392
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Number of 3Xn 0..2 arrays with all rows having a nonnegative second derivative, and all columns having a positive 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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11, 121, 388, 4794, 40416, 375698, 4128762, 41424210, 415135608, 4912230456, 49929186692, 536801738054, 5986390459865, 67884672672695
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