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A222788
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Number of nX2 0..3 arrays with exactly floor(nX2/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order
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1
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0, 3, 8, 55, 294, 1883, 11920, 78255, 517050, 3451712, 23156964, 156076271, 1055435486, 7157673375, 48656943008, 331450961443, 2261939399694, 15461147598417, 105834401893220, 725394224374344, 4977715076045096
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