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Search: id:A008971
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| A008971 |
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Triangle read by rows: T(n,k) is the number of permutations of [n] with k increasing runs of length at least 2. Triangle starts 1; 1; 1,1; 1,5; 1,18,5; 1,58,61; Row n has 1+floor(n/2) terms. |
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| 1, 1, 1, 1, 1, 5, 1, 18, 5, 1, 58, 61, 1, 179, 479, 61, 1, 543, 3111, 1385, 1, 1636, 18270, 19028, 1385, 1, 4916, 101166, 206276, 50521, 1, 14757, 540242, 1949762, 1073517, 50521, 1, 44281, 2819266, 16889786, 17460701, 2702765, 1, 132854, 14494859
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