Number Series Puzzle

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




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To attend world science seminar, A famous chemist from Mexico visit
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Three fair coins are tossed in the air and they land with heads up. Can you calculate the chances that when they are tossed again, two coins will again land with heads up?

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Amazing Facts

Challenging

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