I've got this result from a quick-and-dirty script:

<Reveal this spoiler or all spoilers in this node or all in this thread>
(Update: this agrees with blokhead's and Limbic~Region's result.)

And here's the script itself. It's not perl but ruby.

<Reveal this spoiler>

Update: It turns out that the statement I put in there as a progress indicator does very much redundant calculations, so removing it makes the code twice as fast:

<Reveal this spoiler>

In reply to Re: Challenge: Number of unique ways to reach target sum by ambrus
in thread Challenge: Number of unique ways to reach target sum by Limbic~Region

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