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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.

A209435 Table T(m,n), read by antidiagonals, is the number of subsets of {1,...,n} which do not contain two elements whose difference is m+1.

Table of values

n a(n)
0 1
1 1
2 2
3 1
4 2
5 3
6 1
7 2
8 4
9 5
10 1
11 2
12 4
13 6
14 8
15 1
16 2
17 4
18 8
19 9
20 13
21 1
22 2
23 4
24 8
25 12
26 15
27 21
28 1
29 2
30 4
31 8
32 16
33 18
34 25
35 34
36 1
37 2
38 4
39 8
40 16
41 24
42 27
43 40
44 55
45 1
46 2
47 4
48 8
49 16
50 32
51 36
52 45
53 64
54 89
55 1
56 2
57 4
58 8
59 16
60 32
61 48
62 54
63 75
64 104
65 144
66 1
67 2
68 4
69 8
70 16
71 32
72 64
73 72
74 81

List of values

[1, 1, 2, 1, 2, 3, 1, 2, 4, 5, 1, 2, 4, 6, 8, 1, 2, 4, 8, 9, 13, 1, 2, 4, 8, 12, 15, 21, 1, 2, 4, 8, 16, 18, 25, 34, 1, 2, 4, 8, 16, 24, 27, 40, 55, 1, 2, 4, 8, 16, 32, 36, 45, 64, 89, 1, 2, 4, 8, 16, 32, 48, 54, 75, 104, 144, 1, 2, 4, 8, 16, 32, 64, 72, 81]