Nevermind. It was an interesting idea, but it sucks. 

            Rate   ikegami    albert browseruk
ikegami   5.76/s        --      -26%      -89%
albert    7.84/s       36%        --      -86%
browseruk 54.8/s      851%      599%        --

[download]

Both ikegami and albert's version will be faster per string when processing 1000 strings instead of 100 (since they both have a big overhead), but not enough to even approach BrowserUk's version.

Benchmark code:

<Reveal this spoiler or all in this thread>

In reply to Re^2: Speeding permutation counting by ikegami
in thread Speeding permutation counting by albert

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