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) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | -3 |
| 3 | -26 |
| 4 | 48 |
| 5 | 444 |
| 6 | -920 |
| 7 | -9126 |
| 8 | 19587 |
| 9 | 204214 |
| 10 | -449496 |
| 11 | -4841001 |
| 12 | 10856283 |
| 13 | 119585034 |
| 14 | -271813440 |
| 15 | -3044796399 |
| 16 | 6991433415 |
| 17 | 79341313335 |
| 18 | -183641493481 |
| 19 | -2105713558467 |
| 20 | 4905239040894 |
| 21 | 56722082044512 |
| 22 | -132833292089826 |
| 23 | -1546827734185557 |