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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.

A055461 Square decrescendo subsequences: triangle T(n,k) = (n-k)^2, n >= 1, 0 <= k < n.

Table of values

n a(n)
1 1
2 4
3 1
4 9
5 4
6 1
7 16
8 9
9 4
10 1
11 25
12 16
13 9
14 4
15 1
16 36
17 25
18 16
19 9
20 4
21 1
22 49
23 36
24 25
25 16
26 9
27 4
28 1
29 64
30 49
31 36
32 25
33 16
34 9
35 4
36 1
37 81
38 64
39 49
40 36
41 25
42 16
43 9
44 4
45 1
46 100
47 81
48 64
49 49
50 36
51 25
52 16
53 9
54 4
55 1
56 121
57 100
58 81
59 64
60 49
61 36
62 25
63 16
64 9
65 4
66 1
67 144
68 121
69 100
70 81
71 64
72 49
73 36
74 25
75 16
76 9
77 4
78 1

List of values

[1, 4, 1, 9, 4, 1, 16, 9, 4, 1, 25, 16, 9, 4, 1, 36, 25, 16, 9, 4, 1, 49, 36, 25, 16, 9, 4, 1, 64, 49, 36, 25, 16, 9, 4, 1, 81, 64, 49, 36, 25, 16, 9, 4, 1, 100, 81, 64, 49, 36, 25, 16, 9, 4, 1, 121, 100, 81, 64, 49, 36, 25, 16, 9, 4, 1, 144, 121, 100, 81, 64, 49, 36, 25, 16, 9, 4, 1]

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