# Identifying the sequence

• Mar 5th 2012, 05:08 PM
pranay
Identifying the sequence
hi, i'm unable to get the pattern for the sequence: 2,4,11,36,147,778,.. I even checked in oeis.org but it doesn't have it. Could someone please help in determining how the terms are related to each other in this sequence?
Thanks.
• Mar 7th 2012, 06:39 AM
Soroban
Re: Identifying the sequence
Hello, pranay!

Are there typos?
With a different first term and sixth term, I have a pattern.

Quote:

Sequence: .1, 4, 11, 36, 147, 738 . . .

$a_{n+1} \:=\:n\:\!a_n + 3$

• Mar 7th 2012, 09:08 AM
pranay
Re: Identifying the sequence
Thanks Soroban, no there are no typos the terms are as it is..
• Apr 21st 2012, 01:02 AM
ignite
Re: Identifying the sequence
It's an=n!+2n-n
• Apr 22nd 2012, 12:06 PM
NowIsForever
Re: Identifying the sequence
Quote:

Originally Posted by ignite
It's an=n!+2n-n

How did you do that? Do you have Ramanujan's blood running in your veins?
• Apr 22nd 2012, 12:21 PM
ignite
Re: Identifying the sequence
I came across this problem on SPOJ.I first guessed the factorial part.And the rest could be found on OEIS.