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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.

A354577 Variant of A253028 using only even numbers: a mirror symmetric array of even numbers where the n-th term is equal to the number of terms in the n-th row of the array.

Table of values

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

List of values

[2, 4, 6, 2, 4, 8, 10, 6, 2, 4, 8, 12, 14, 16, 18, 10, 12, 20, 22, 14, 6, 2, 4, 8, 16, 24, 26, 18, 10, 6, 2, 4, 8, 12, 20, 28, 30, 22, 14, 16, 24, 32, 34, 36, 38, 26, 28, 40, 42, 30, 18, 10, 12, 20, 32, 44, 46, 34, 22, 14, 6, 2, 4, 8, 16, 24, 36, 48, 50, 38, 26]

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