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A223107
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Number of 4Xn 0..2 arrays with exactly floor(4Xn/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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0, 280, 13416, 737254, 40395409, 2222762597, 123093376161, 6858519798139, 384184470564745, 21618570758835696, 1221246943086629366, 69219708062618487810, 3934674396591601892887, 224222135757151794516896
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