SPOJ.com - Problem LGIC

LGIC - LOGIC

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Given a sequance of natural numbers.

Find N'th term of this sequence.

a1=2, a2=4, a3=11, a4=36, a5=147, a6=778 ... ... ... ... aN.

Only one natural number 7<=N<20.

One natural number. N'th term of the sequence.

Input:
10
Output:
3629814

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	MR. BEAN : 2015-01-21 02:20:45 My first python code :)
	(Tjandra Satria Gunawan)(æ›¾æ¯…æ˜†): 2015-01-21 02:20:45 @numerix: thanks, now 58B with built in function ;)
	numerix: 2015-01-21 02:20:45 @Tjandra: You can solve it with less than 60 bytes ...
	(Tjandra Satria Gunawan)(æ›¾æ¯…æ˜†): 2015-01-21 02:20:45 only 79 characters needed to code the solution in python 3 (79B) ;)
	:D: 2015-01-21 02:20:45 I would say O(N) will most certainly pass.
	numerix: 2015-01-21 02:20:45 Please open it for more/all languages. Edit: It's done, thanks. Last edit: 2012-02-21 09:36:07
	[Rampage] Blue.Mary: 2015-01-21 02:20:45 O(N) solution CAN pass.