Trivia

Subject:
Re: Answer -- Toy Blocks

Larry Barrett
Pretty complicated.
It is interesting that there is left-to-right symmetry in the number of ways to add one more block as you go up, i.e. 1, 1 1, 1 2 1, 1 3 2 3 1, etc, sort of like Pascal's triangle.
Except in the 8th row where it is 70 56 90 42 56 70.

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