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A223122
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Number of nX4 0..2 arrays with no more than floor(nX4/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order
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1
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10, 489, 28907, 1780641, 112106293, 7157970340, 461597847603, 29989116614529, 1959625907209239, 128645318481467647, 8477443608456769792, 560422268684443059564, 37148157807866359018565, 2468123723995159036467948
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