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Math Help - Easy sequence needed

  1. #1
    Member
    Joined
    Nov 2009
    Posts
    169

    Easy sequence needed

    Hey guys, shoudl be really easy for you, but I somehow cannot figure it out.

    Im looking for an explicit equation of the sequence a_n with

    a_0 = 1 (this would be good, but is not needed necessarily)
    a_1 = 4
    a_2 = 24
    a_3 = 192
    a_4 = 1920

    You see, we multiply by 4, then by 6, then by 8, then by 10 etc., anyone can tell em an explicit solution?
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  2. #2
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    Aug 2009
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    a_n=2^{n}(n+1)!
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