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A222744
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Number of nX5 0..3 arrays with exactly floor(nX5/2) elements equal 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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20, 7546, 6363724, 5989744766, 4906560167364, 4777709698876890, 4001484076145095954, 4007703500495273447052, 3396887706615718195456805, 3458279283218841589487839312, 2953874525277026876992243827814
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