This solution together with the solution of James' (or mine) exhibits a nice duality between the "top-down" and "bottom-up" approaches.
Nice! When you go from the bottom, solution automatically goes to a(1).
Thanks. I coded that solution up LONG before movmax became a thing...
Word Counting and Indexing
Find the peak 3n+1 sequence value
Convert from Base 10 to base 5
Permute diagonal and antidiagonal
Project Euler: Problem 11, Largest product in a grid
Project Euler: Problem 14, Longest Collatz sequence
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