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A087923
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Number of ways of arranging the numbers 1 ... 2n into a 2 X n array so there is exactly one local maximum.
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1
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2, 16, 208, 3584, 76544, 1947648, 57477120, 1929117696, 72545402880, 3020819005440, 137959904378880, 6855868809216000, 368270708268072960, 21262037565623500800, 1312956239068318924800
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