1, 2, 5, 14, 42, 132, 429, .......
What rule does this sequence follow?
I was wondering about that one.
I was going to look it up in
"Online Encyclopedia of Integer Sequences" OEIS
but I was on my phone all day so it was too difficult.
I'll do it now :)
It is not at all surprsing that it gives the same answer as Heureka.
OEIS is a great resource, one that is well worth remembering.
It is mentioned in our Reference material thread, which is in the Sticky topics. :)