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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.

A174740 Triangle read by rows, A027293 * an infinite lower triangular matrix with A147843 as the diagonal and the rest zeros.

Table of values

n a(n)
1 1
2 1
3 2
4 2
5 2
6 0
7 3
8 4
9 0
10 0
11 5
12 6
13 0
14 0
15 -5
16 7
17 10
18 0
19 0
20 -5
21 0
22 11
23 14
24 0
25 0
26 -10
27 0
28 -7
29 15
30 22
31 0
32 0
33 -15
34 0
35 -7
36 0
37 22
38 30
39 0
40 0
41 -25
42 0
43 -14
44 0
45 0
46 30
47 44
48 0
49 0
50 -35
51 0
52 -21
53 0
54 0
55 0
56 42
57 60
58 0
59 0
60 -55
61 0
62 -35
63 0
64 0
65 0
66 0
67 56
68 84
69 0
70 0
71 -75
72 0
73 -49
74 0
75 0
76 0
77 0
78 12

List of values

[1, 1, 2, 2, 2, 0, 3, 4, 0, 0, 5, 6, 0, 0, -5, 7, 10, 0, 0, -5, 0, 11, 14, 0, 0, -10, 0, -7, 15, 22, 0, 0, -15, 0, -7, 0, 22, 30, 0, 0, -25, 0, -14, 0, 0, 30, 44, 0, 0, -35, 0, -21, 0, 0, 0, 42, 60, 0, 0, -55, 0, -35, 0, 0, 0, 0, 56, 84, 0, 0, -75, 0, -49, 0, 0, 0, 0, 12]

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