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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	Syed Sarfaraz Akhtar: 2015-01-21 02:20:45 very weak test cases...
	Rishwanth: 2015-01-21 02:20:45 AC in first attempt.. my first in python.. :D
	Vaibhav Yenamandra: 2015-01-21 02:20:45 Ruby, 2 lines :)
	(Tjandra Satria Gunawan)(æ›¾æ¯…æ˜†): 2015-01-21 02:20:45 solved using brainf**k ;-)
	Francky: 2015-01-21 02:20:45 This is a 'riddle' problem. Moved.
	shiva_hellgeek: 2015-01-21 02:20:45 Is the limit really- n<=10^18???? then how is it possible that the answer can be stored in lld???? :p :p :p
	Himanshu: 2015-01-21 02:20:45 a(N)<=10^18 question is misguiding...... ah.. ac in 1st attempt
	@looser@: 2015-01-21 02:20:45 only 5 line code in python
	Ikhaduri: 2015-01-21 02:20:45 This problem has the most pathetic test cases I have ever encountered. Plus constraints are misleading and big integer arithmetic isn't needed.