solve it!~

well, I have received this mail for really alot alot of times and I haven't solve the question until yesterday...

since I am sooo sooooo free, I decided to do it...

 

here's the question

what is the value of the 6th number in the sequence?

 

1, 2, 6, 42, 1806, ?????

 

 

after solving it, download this file and open it...

this is an password protected file and the answer for the question above is the password for you to open it!~

 

try, it's really fun, and it is really really east to solve the question!