Number Series Puzzle

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?




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The Puzzle: Here is a famous prize problem that Sam Loyd issued in 1882, offering $1000 as a prize for the best answer showing how to arrange the seven figures and the eight 'dots' .4.5.6.7.8.9.0. which would add up to 82

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I Speak only the Truth

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