ajs / perl6-Math-Sequences

Useful mathematical sequences
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A000140 / kendall-mann #105

Open AlexDaniel opened 5 years ago

AlexDaniel commented 5 years ago

A000140 / Kendall-Mann numbers: the maximal number of inversions in a permutation on n letters is floor(n(n-1)/4); a(n) is the number of permutations with this many inversions.

The sequence is not implemented yet.

1 1 2 6 22 101 573 3836 29228 250749 2409581 25598186 296643390 3727542188 50626553988 738680521142 11501573822788 190418421447330 3344822488498265 62119523114983224 1214967840930909302