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A262127
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Number of permutations p of [2n] such that the up-down signature of p has nonnegative partial sums with a maximal value of n.
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2
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1, 1, 3, 57, 778, 47673, 1477381, 196352061, 10896848134, 2539183745028, 220995092995233, 79875004816604671, 10032237471596350240, 5198811549997063847059, 890008776794671492878641, 626002734896306246681963237, 140112228518254335504033414806
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OFFSET
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0,3
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LINKS
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FORMULA
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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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