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A087924
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Number of ways of arranging the numbers 1 ... 3n into a 3 X n array so there is exactly one local maximum.
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0
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4, 208, 29568, 7452704, 2941306368, 1683453629440, 1323082429842432, 1370418864769445888, 1811764909105311267840, 2980039854936078219167744, 5972307516078119199647692800
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