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...
Sums with Excluded Digits
Sum of first n terms of a harmonic progression
Combinations without using nchoosek
Unique values without using UNIQUE function
Determine the number of odd integers in a vector
Project Euler: Problem 11, Largest product in a grid
Project Euler: Problem 14, Longest Collatz sequence
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