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Recurrence Relation

  1. Nov 15, 2009 #1
    1. The problem statement, all variables and given/known data
    Got this recurrence relation when trying to solve for a series solution to a differential equation: [tex]a_n=\frac{a_{n-5}}{n(n-1)} , a_0,a_1=constant , a_2,a_3,a_4=0[/tex]

    2. Relevant equations



    3. The attempt at a solution
    My attempt at a solution involved first writing out all the terms which led to the pattern [tex]a_5=\frac{a_0}{5\cdot4}[/tex] and [tex]a_6=\frac{a_1}{6\cdot5}[/tex] and [tex] a_{10}=\frac{a_0}{10\cdot9\cdot5\cdot4}...a_{15}=\frac{a_0}{15\cdot14\cdot10\cdot9\cdot5\cdot4}[/tex]

    I ended up with [tex] a_n=\frac{a_0}{5^n \cdot n!}[/tex] missing something on the bottom which as far as I can tell is [tex](5(n)-1)(5(n-1)-1)(5(n-2)-1)...[/tex]
    The problem is that i can't figure out a more concise simple expression for this last part. Any help would be greatly appreciated!
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
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