n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 1 |
4 | -1 |
5 | -1 |
6 | 2 |
7 | 2 |
8 | -2 |
9 | -2 |
10 | 3 |
11 | 3 |
12 | -3 |
13 | -3 |
14 | 4 |
15 | 4 |
16 | -4 |
17 | -4 |
18 | 5 |
19 | 5 |
20 | -5 |
21 | -5 |
22 | 6 |
23 | 6 |
24 | -6 |
25 | -6 |
26 | 7 |
27 | 7 |
28 | -7 |
29 | -7 |
30 | 8 |
31 | 8 |
32 | -8 |
33 | -8 |
34 | 9 |
35 | 9 |
36 | -9 |
37 | -9 |
38 | 10 |
39 | 10 |
40 | -10 |
41 | -10 |
42 | 11 |
43 | 11 |
44 | -11 |
45 | -11 |
46 | 12 |
47 | 12 |
48 | -12 |
49 | -12 |
50 | 13 |
51 | 13 |
52 | -13 |
53 | -13 |
54 | 14 |
55 | 14 |
56 | -14 |
57 | -14 |
58 | 15 |
59 | 15 |
60 | -15 |
61 | -15 |
62 | 16 |
63 | 16 |
64 | -16 |
65 | -16 |
66 | 17 |
67 | 17 |
68 | -17 |
69 | -17 |
70 | 18 |
71 | 18 |
72 | -18 |
73 | -18 |
74 | 19 |
75 | 19 |
76 | -19 |
77 | -19 |
78 | 20 |
79 | 20 |
80 | -20 |
81 | -20 |
[0,0,1,1,-1,-1,2,2,-2,-2,3,3,-3,-3,4,4,-4,-4,5,5, -5,-5,6,6,-6,-6,7,7,-7,-7,8,8,-8,-8,9,9,-9,-9,10, 10,-10,-10,11,11,-11,-11,12,12,-12,-12,13,13,-13, -13,14,14,-14,-14,15,15,-15,-15,16,16,-16,-16,17, 17,-17,-17,18,18,-18,-18,19,19,-19,-19,20,20,-20, -20] |