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A177322
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Number of permutations of n copies of 1..4 with all adjacent differences <= 2 in absolute value.
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1
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12, 660, 51240, 4635540, 457507512, 47768769048, 5188083048720, 580132098966420, 66341857216154520, 7722843117550721160, 912113857017595941072, 109025503164832356811800
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OFFSET
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1,1
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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