+0  
 
+5
432
2
avatar+7002 

1, 2, 5, 14, 42, 132, 429, .......

What rule does this sequence follow?

MaxWong  Jul 28, 2016

Best Answer 

 #1
avatar+19653 
+10

1, 2, 5, 14, 42, 132, 429, .......

What rule does this sequence follow?

 

see: https://en.wikipedia.org/wiki/Catalan_number

 

laugh

heureka  Jul 28, 2016
 #1
avatar+19653 
+10
Best Answer

1, 2, 5, 14, 42, 132, 429, .......

What rule does this sequence follow?

 

see: https://en.wikipedia.org/wiki/Catalan_number

 

laugh

heureka  Jul 28, 2016
 #2
avatar+92805 
+10

Thanks Heureka,

 

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 :)  

 

https://oeis.org/search?q=1%2C+2%2C+5%2C+14%2C+42%2C+132%2C+429%2C&language=english&go=Search

 

 

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.  :)

Melody  Jul 28, 2016

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