Mathsmania - try it!

弟弟轉來一封電郵，是考我數學的。
自從用了電腦，我的數學已經通通還給數學老師了...>"< ===================================================================
ONLY SMARTIE GOT THE ANSWER!

For those who like a maths challenge - Mathsmania - try it!

FOR MATHS-INCLINED, PLEASE SOLVE......

QUESTION:
what's the next number??
1, 2, 6, 42, 1806, ?

the next number is the password to the excel file.
add your name in the list if you got the correct answer and pass it on!..

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（我好想打開那個檔案看看有誰的名字在裏面。）

後記：昨晚把弄了半天弄不成的“榮譽榜”交給另外一位老師做，小朋友看到跑來跟我說：“老師你要用IQ。”

IQ??藝術細胞跟IQ有關係嗎？？

（嗚~~我認輸啦！）