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Search: id:A152494
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| A152494 |
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1/3 of the number of permutations of 2 indistinguishable copies of 1..n with exactly 2 local maxima. |
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| 0, 1, 19, 235, 2539, 26119, 263863, 2648107, 26513875, 265250287, 2652876847
(list; graph; listen)
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