Number Series Puzzle

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




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? ? ? ?

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There is a square piece of paper with a hole that is denoted by the circle on the top right side in the given picture. You have to cut the paper in a manner that it forms two and only two separate pieces of paper and then rearrange the pieces in a manner that the holes come in the centre of the paper.

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Replace the Number

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A B C D E F G H

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There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.