More links & stuff in full description below ↓↓↓
Graham’s Number: http://bit.ly/G_Number
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Some good additional reading on Tree(3):
https://cp4space.wordpress.com/2012/12/19/fast-growing-2/
https://en.wikipedia.org/wiki/Kruskal%27s_tree_theorem
https://mathoverflow.net/questions/93828/how-large-is-tree3