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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.

A309507 Number of ways the n-th triangular number T(n) = A000217(n) can be written as the difference of two positive triangular numbers.

Table of values

n a(n)
1 0
2 1
3 1
4 1
5 3
6 3
7 1
8 2
9 5
10 3
11 3
12 3
13 3
14 7
15 3
16 1
17 5
18 5
19 3
20 7
21 7
22 3
23 3
24 5
25 5
26 7
27 7
28 3
29 7
30 7
31 1
32 3
33 7
34 7
35 11
36 5
37 3
38 7
39 7
40 3
41 7
42 7
43 3
44 11
45 11
46 3
47 3
48 5
49 8
50 11
51 7
52 3
53 7
54 15
55 7
56 7
57 7
58 3
59 7
60 7
61 3
62 11
63 5
64 3
65 15
66 7
67 3
68 7
69 15
70 7
71 5
72 5
73 3
74 11
75 11
76 7
77 15
78 7
79 3
80 9
81 9
82 3
83 7

List of values

[0, 1, 1, 1, 3, 3, 1, 2, 5, 3, 3, 3, 3, 7, 3, 1, 5, 5, 3, 7, 7, 3, 3, 5, 5, 7, 7, 3, 7, 7, 1, 3, 7, 7, 11, 5, 3, 7, 7, 3, 7, 7, 3, 11, 11, 3, 3, 5, 8, 11, 7, 3, 7, 15, 7, 7, 7, 3, 7, 7, 3, 11, 5, 3, 15, 7, 3, 7, 15, 7, 5, 5, 3, 11, 11, 7, 15, 7, 3, 9, 9, 3, 7]

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