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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.

A128306 Triangle read by rows: A054521 * A007318 as infinite lower triangular matrices.

Table of values

n a(n)
1 1
2 1
3 0
4 2
5 1
6 0
7 2
8 2
9 1
10 0
11 4
12 6
13 4
14 1
15 0
16 2
17 4
18 6
19 4
20 1
21 0
22 6
23 15
24 20
25 15
26 6
27 1
28 0
29 4
30 12
31 22
32 24
33 16
34 6
35 1
36 0
37 6
38 21
39 45
40 60
41 51
42 27
43 8
44 1
45 0
46 4
47 16
48 44
49 76
50 85
51 62
52 29
53 8
54 1
55 0
56 10
57 45
58 120
59 210
60 252
61 210
62 120
63 45
64 10
65 1
66 0
67 4
68 20
69 66
70 144
71 226
72 258
73 211
74 120
75 45
76 10
77 1
78 0

List of values

[1, 1, 0, 2, 1, 0, 2, 2, 1, 0, 4, 6, 4, 1, 0, 2, 4, 6, 4, 1, 0, 6, 15, 20, 15, 6, 1, 0, 4, 12, 22, 24, 16, 6, 1, 0, 6, 21, 45, 60, 51, 27, 8, 1, 0, 4, 16, 44, 76, 85, 62, 29, 8, 1, 0, 10, 45, 120, 210, 252, 210, 120, 45, 10, 1, 0, 4, 20, 66, 144, 226, 258, 211, 120, 45, 10, 1, 0]

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