Number Series Puzzle

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




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A man desired to get into his work building, however he had forgotten his code.
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A bank customer had $100 in his account. He then made 6 withdrawals. He kept a record of these withdrawals, and the balance remaining in the account, as follows:

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----- -----
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Artificial Intelligence has crushed all human records in the puzzle game “2048,” achieving a high score of 839,732 and beating the game in only 973 moves without using any undo.