<PRE><B>Question 1111515</B>
&lt;pre&gt;
a&lt;sub&gt;1&lt;/sub&gt; = 1+1 = 2
a&lt;sub&gt;2&lt;/sub&gt; = 2²/4 = 1
a&lt;sub&gt;3&lt;/sub&gt; = 3+1 = 4
a&lt;sub&gt;4&lt;/sub&gt; = 4²/4 = 4
a&lt;sub&gt;5&lt;/sub&gt; = 5+1 = 6
a&lt;sub&gt;6&lt;/sub&gt; = 6²/4 =9
a&lt;sub&gt;7&lt;/sub&gt; = 7+1 = 8

a&lt;sub&gt;n&lt;/sub&gt; = [n mod 2](n+1) + [(n+1) mod 2](n²/4) 

Edwin&lt;/pre&gt;



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