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A122647
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Number of permutations of length 2n-1 with no local maxima or minima in even positions.
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1
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1, 2, 14, 204, 5104, 195040, 10570416, 771171296, 72871890176, 8658173200896, 1263326817241600, 222078432102900736, 46291130226003357696, 11289508838355990634496, 3184719803676823556888576, 1028950134725811309304442880, 377483869192551997938994315264, 156057810922284533544621710639104
(list; graph; refs; listen; history; internal format)
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