A Cool Number Puzzle

Here’s a neat number puzzle.  What number should go where the “?” is?

NobsNumberTree

(It may look like there’s a mistake — but there isn’t!)

Via Puzzles.com:  http://www.puzzles.com/puzzleplayground/NobsNumberTree/NobsNumberTree.htm

BADGING:  Solve the puzzle!  No cheating!  Explain what number should take the place of the “?” and why it belongs there.

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