cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A140756 Count up to k sequence with alternating signs (k always positive).

Table of values

n a(n)
1 1
2 -1
3 2
4 1
5 -2
6 3
7 -1
8 2
9 -3
10 4
11 1
12 -2
13 3
14 -4
15 5
16 -1
17 2
18 -3
19 4
20 -5
21 6
22 1
23 -2
24 3
25 -4
26 5
27 -6
28 7
29 -1
30 2
31 -3
32 4
33 -5
34 6
35 -7
36 8
37 1
38 -2
39 3
40 -4
41 5
42 -6
43 7
44 -8
45 9
46 -1
47 2
48 -3
49 4
50 -5
51 6
52 -7
53 8
54 -9
55 10
56 1
57 -2
58 3
59 -4
60 5
61 -6
62 7
63 -8
64 9
65 -10
66 11
67 -1
68 2
69 -3
70 4
71 -5
72 6
73 -7
74 8
75 -9
76 10
77 -11
78 12
79 1
80 -2
81 3
82 -4
83 5
84 -6
85 7
86 -8
87 9
88 -10
89 11
90 -12
91 13

List of values

[1, -1, 2, 1, -2, 3, -1, 2, -3, 4, 1, -2, 3, -4, 5, -1, 2, -3, 4, -5, 6, 1, -2, 3, -4, 5, -6, 7, -1, 2, -3, 4, -5, 6, -7, 8, 1, -2, 3, -4, 5, -6, 7, -8, 9, -1, 2, -3, 4, -5, 6, -7, 8, -9, 10, 1, -2, 3, -4, 5, -6, 7, -8, 9, -10, 11, -1, 2, -3, 4, -5, 6, -7, 8, -9, 10, -11, 12, 1, -2, 3, -4, 5, -6, 7, -8, 9, -10, 11, -12, 13]