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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.

A209437 Table of T(m,n), read by antidiagonals, is the number of subsets of {1,...,n} which contain two elements whose difference is m.

Table of values

n a(n)
1 1
2 0
3 3
4 0
5 2
6 8
7 0
8 0
9 7
10 19
11 0
12 0
13 4
14 17
15 43
16 0
17 0
18 0
19 14
20 39
21 94
22 0
23 0
24 0
25 8
26 37
27 88
28 201
29 0
30 0
31 0
32 0
33 28
34 83
35 192
36 423
37 0
38 0
39 0
40 0
41 16
42 74
43 181
44 408
45 880
46 0
47 0
48 0
49 0
50 0
51 56
52 175
53 387
54 855
55 1815
56 0
57 0
58 0
59 0
60 0
61 32
62 148
63 377
64 824
65 1775
66 3719
67 0
68 0
69 0
70 0
71 0

List of values

[1, 0, 3, 0, 2, 8, 0, 0, 7, 19, 0, 0, 4, 17, 43, 0, 0, 0, 14, 39, 94, 0, 0, 0, 8, 37, 88, 201, 0, 0, 0, 0, 28, 83, 192, 423, 0, 0, 0, 0, 16, 74, 181, 408, 880, 0, 0, 0, 0, 0, 56, 175, 387, 855, 1815, 0, 0, 0, 0, 0, 32, 148, 377, 824, 1775, 3719, 0, 0, 0, 0, 0]