Recamans sequence FIXED

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Problem

Credits to original problem's author:
http://golf.shinh.org/p.rb?Recamans+sequence

Options

exec is denied

rejudge feature is enabled

now post-mortem time, all source codes will be revealed

Sample input:_

*NOTHING*

Sample output:

0
1
3
6
2
7
13
20
12
21
11
22
10
23
9
24
8
25
43
62
42
63
41
18
42
17
43
16
44
15
45
14
46
79
113
78
114
77
39
78
38
79
37
80
36
81
35
82
34
83
33
84
32
85
31
86
30
87
29
88
28
89
27
90
26
91
157
224
156
225
155

Ranking

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