title: Creating a Sequence with positive and negative numbers in R
body: <p>I have been trying to create a function for the sequence of following series:</p>
  
  <p>1,-2,-3, 4, 5, 6, -7 ,-8, -9, -10........n  (1 positive, 2 negatives, 3 positives, 4 negatives … and goes on up to n). </p>
  
  <p>Creating a non-negative  sequence is quite easy, but these negative terms are testing me. </p>
  
  <p>If anyone can help me over this</p>