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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.

A066956 a(n) is the number of ways of placing '+' and '-' among the digits 123456789 so that the result of the expression is n, '-' before 1 not allowed.

Table of values

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

List of values

[11, 26, 11, 18, 8, 21, 12, 17, 8, 22, 12, 21, 11, 16, 15, 20, 8, 17, 11, 20, 15, 16, 11, 23, 18, 13, 14, 21, 15, 19, 17, 14, 19, 19, 7, 14, 19, 19, 17, 18, 16, 17, 18, 10, 15, 26, 18, 15, 16, 12, 17, 19, 9, 17, 21, 16, 13, 14, 16, 17, 17, 11, 13, 22, 14, 13, 15, 15, 15, 17, 7]

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