The Sagan-Savage Lucas-Catalan Polynomials Have Positive Coefficients
  This short article answers a question asked by Bruce Sagan in the last few minutes of his wonderful talk (http://www.youtube.com/watch?v=Fdn890jg2U0), (describing joint work with Carla Savage) at the Rutgers University Experimental Mathematics seminar delivered on Dec. 9, 2010. 
Shalosh B. Ekhad
math.CO