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.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | -177146 |
| 4 | 1 |
| 5 | 48828126 |
| 6 | -177146 |
| 7 | -1977326742 |
| 8 | 1 |
| 9 | 31380882463 |
| 10 | 48828126 |
| 11 | -285311670610 |
| 12 | -177146 |
| 13 | 1792160394038 |
| 14 | -1977326742 |
| 15 | -8649707208396 |
| 16 | 1 |
| 17 | 34271896307634 |
| 18 | 31380882463 |
| 19 | -116490258898218 |
| 20 | 48828126 |
| 21 | 350275523038332 |
| 22 | -285311670610 |