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 | 8 |
| 3 | 17 |
| 4 | 17 |
| 5 | -78 |
| 6 | -585 |
| 7 | -2021 |
| 8 | -1710 |
| 9 | 29395 |
| 10 | 231413 |
| 11 | 856264 |
| 12 | -346979 |
| 13 | -30019585 |
| 14 | -232782792 |
| 15 | -834712259 |
| 16 | 2313820717 |
| 17 | 59793779314 |
| 18 | 469729578123 |
| 19 | 1597321309383 |
| 20 | -9914171906614 |
| 21 | -206169178856073 |
| 22 | -1697255630380351 |
| 23 | -5677886943413120 |
| 24 | 55801423903125353 |