What is the probability that the numbers that come up will be in ascending order (not necessarily strictly ascending, but never a lower number after a higher)?
Intended to be solved without a computer.
1. How did you arrive at the sequence a(1) = 6; a(2) = 21; etc.
2. Was the source Sloane's OEIS?
3. Was a computer used in looking this up?
flooble's webmaster puzzle