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Math Help - Identifying the sequence

  1. #1
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    Identifying the sequence

    hi, i'm unable to get the pattern for the sequence: 2,4,11,36,147,778,.. I even checked in oeis.org but it doesn't have it. Could someone please help in determining how the terms are related to each other in this sequence?
    Thanks.
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  2. #2
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    Re: Identifying the sequence

    Hello, pranay!

    Are there typos?
    With a different first term and sixth term, I have a pattern.


    Sequence: .1, 4, 11, 36, 147, 738 . . .

    a_{n+1} \:=\:n\:\!a_n + 3

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  3. #3
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    Re: Identifying the sequence

    Thanks Soroban, no there are no typos the terms are as it is..
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  4. #4
    Junior Member ignite's Avatar
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    Re: Identifying the sequence

    It's an=n!+2n-n
    Last edited by ignite; April 21st 2012 at 12:04 AM.
    Thanks from princeps, pranay and NowIsForever
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  5. #5
    Junior Member NowIsForever's Avatar
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    Re: Identifying the sequence

    Quote Originally Posted by ignite View Post
    It's an=n!+2n-n
    How did you do that? Do you have Ramanujan's blood running in your veins?
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  6. #6
    Junior Member ignite's Avatar
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    Re: Identifying the sequence

    I came across this problem on SPOJ.I first guessed the factorial part.And the rest could be found on OEIS.
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