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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.

A001226 Lerch's function q_2(n) = (2^{phi(t)} - 1)/t where t = 2*n - 1.

Table of values

n a(n)
1 1
2 1
3 3
4 9
5 7
6 93
7 315
8 17
9 3855
10 13797
11 195
12 182361
13 41943
14 9709
15 9256395
16 34636833
17 31775
18 479349
19 1857283155
20 430185
21 26817356775
22 102280151421
23 372827
24 1497207322929
25 89756051247
26 84215045
27 84973577874915
28 19991120505
29 1205604855
30 4885260612740877

List of values

[1, 1, 3, 9, 7, 93, 315, 17, 3855, 13797, 195, 182361, 41943, 9709, 9256395, 34636833, 31775, 479349, 1857283155, 430185, 26817356775, 102280151421, 372827, 1497207322929, 89756051247, 84215045, 84973577874915, 19991120505, 1205604855, 4885260612740877]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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