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 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 7 |
| 4 | 8 |
| 5 | 11 |
| 6 | 10 |
| 7 | 7 |
| 8 | 8 |
| 9 | 19 |
| 10 | 14 |
| 11 | 337 |
| 12 | 1028 |
| 13 | 5 |
| 14 | -2 |
| 15 | -1681 |
| 16 | 1936 |
| 17 | 22133 |
| 18 | -21734 |
| 19 | -87223 |
| 20 | 87388 |
| 21 | 427291 |
| 22 | -427222 |
| 23 | -118181363 |
| 24 | 118182728 |
| 25 | 4276553 |
| 26 | -4276550 |
| 27 | -11874730297 |
| 28 | 11874730732 |
| 29 | 4307920641583 |