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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.

A108223 a(n) = sigma_{2n}(n^2)/sigma_n(n^2), where sigma_n(m) = Sum_{d|m} d^n.

Table of values

n a(n)
1 1
2 13
3 703
4 61681
5 9762501
6 2140365529
7 678222249307
8 280379743338241
9 150087010086914941
10 99902428887422922553
11 81402749386554449442711
12 79477293980103609858493681
13 91733330193268313783293023757
14 123469159731637675342948027295569
15 191751045863140709562160603031808243

List of values

[1, 13, 703, 61681, 9762501, 2140365529, 678222249307, 280379743338241, 150087010086914941, 99902428887422922553, 81402749386554449442711, 79477293980103609858493681, 91733330193268313783293023757, 123469159731637675342948027295569, 191751045863140709562160603031808243]

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

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