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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.

A364933 a(n) = Sum_{k=1..n} A191898(n,k)*[A191904(n,k) = A191898(n,k)].

Table of values

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

List of values

[0, -1, -1, 0, -1, -2, -1, 2, 3, -2, -1, 0, -1, -2, 1, 6, -1, 2, -1, 2, 3, -2, -1, 4, 15, -2, 15, 4, -1, 0, -1, 14, 7, -2, 13, 8, -1, -2, 9, 10, -1, 2, -1, 8, 17, -2, -1, 12, 35, 14, 13, 10, -1, 14, 25, 16, 15, -2, -1, 8, -1, -2, 27, 30, 31, 6, -1, 14, 19, 12]

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