Going Back to Neil Sloane's FIRST LOVE (OEIS Sequence A435): On the   Total Heights in Rooted Labeled Trees
  In this tribute to Neil Sloane, we revisit the first sequence in the On-Line Encyclopedia of Integer Sequences, sequence A435 (1, 8, 78, 944, 13800, 237432, 4708144, 105822432, ...), that he encountered when he was a graduate student, and when normalized gives the average total height of rooted labeled trees. We state rigorously-computed explicit expressions for the first twelve moments of the random variable `total height' on rooted labeled trees, and pledge to donate to the OEIS 100 dollars in honor of the first to find an explicit expression for the probability density function of the limiting scaled probability distribution, as n goes to infinity. 
Shalosh B. Ekhad and Doron Zeilberger
math.CO