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A222770
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Number of 2Xn 0..1 arrays with exactly floor(2Xn/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..1 order
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1
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0, 3, 4, 11, 18, 73, 152, 470, 1022, 3361, 7840, 23386, 57626, 172387, 434280, 1257025, 3275034, 9399647, 24776572, 70325187, 188540168, 531573662, 1436226680, 4032772569, 10987025446, 30742228871, 84180549328, 235159618106
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