Nice, using redo to explicitly perform tail-end recursion optomization. I'm wondering if the optimizer can figure that out?

Hmm, but yours gives the wrong answer for A(3,3). (61 instead of 65536)

—John

In reply to Re: Re (tilly) 1: Ackerman vs. Perl : KO in 3 rounds by John M. Dlugosz
in thread Ackerman vs. Perl : KO in 3 rounds by John M. Dlugosz

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