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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.

A292870 Square array A(n,k), n>=0, k>=0, read by antidiagonals, where column k is the expansion of k-th power of continued fraction 1/(1 - x - x^2/(1 - 2*x - 2*x^2/(1 - 3*x - 3*x^2/(1 - 4*x - 4*x^2/(1 - ...))))).

Table of values

n a(n)
0 1
1 1
2 0
3 1
4 1
5 0
6 1
7 2
8 2
9 0
10 1
11 3
12 5
13 5
14 0
15 1
16 4
17 9
18 14
19 15
20 0
21 1
22 5
23 14
24 28
25 44
26 52
27 0
28 1
29 6
30 20
31 48
32 93
33 154
34 203
35 0
36 1
37 7
38 27
39 75
40 169
41 333
42 595
43 877
44 0
45 1
46 8
47 35
48 110
49 280
50 624
51 1289
52 2518
53 4140
54 0
55 1
56 9
57 44
58 154
59 435
60 1071
61 2442
62 5394
63 11591
64 21147
65 0
66 1
67 10
68 54
69 208
70 644
71 1728
72 4265
73 10188
74 24366
75 57672
76 115975
77 0

List of values

[1, 1, 0, 1, 1, 0, 1, 2, 2, 0, 1, 3, 5, 5, 0, 1, 4, 9, 14, 15, 0, 1, 5, 14, 28, 44, 52, 0, 1, 6, 20, 48, 93, 154, 203, 0, 1, 7, 27, 75, 169, 333, 595, 877, 0, 1, 8, 35, 110, 280, 624, 1289, 2518, 4140, 0, 1, 9, 44, 154, 435, 1071, 2442, 5394, 11591, 21147, 0, 1, 10, 54, 208, 644, 1728, 4265, 10188, 24366, 57672, 115975, 0]

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