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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.

A355588 T(j,k) are the denominators v in the representation R = s/t + (2*sqrt(3)/Pi)*u/v of the resistance between two nodes separated by the distance (j,k) in an infinite triangular lattice of one-ohm resistors, where T(j,k), j >= 0, 0 <= k <= floor(j/2) is an irregular triangle read by rows.

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 1
5 1
6 1
7 1
8 1
9 1
10 1
11 1
12 5
13 5
14 5
15 5
16 5
17 5
18 5
19 5
20 35
21 35
22 35
23 35
24 35
25 35
26 35
27 35
28 35
29 35
30 35
31 7
32 35
33 7
34 35
35 35
36 7
37 35
38 35
39 35
40 35
41 35
42 55
43 385
44 385
45 385
46 55
47 55
48 385
49 11
50 55
51 385
52 385
53 385
54 385
55 55
56 5005
57 455
58 5005
59 5005
60 455
61 5005
62 5005
63 5005
64 5005
65 5005
66 5005
67 5005
68 5005
69 1001
70 143
71 1001

List of values

[1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 5, 5, 5, 5, 5, 5, 5, 5, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 7, 35, 7, 35, 35, 7, 35, 35, 35, 35, 35, 55, 385, 385, 385, 55, 55, 385, 11, 55, 385, 385, 385, 385, 55, 5005, 455, 5005, 5005, 455, 5005, 5005, 5005, 5005, 5005, 5005, 5005, 5005, 1001, 143, 1001]

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