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 | 0 |
| 2 | -3 |
| 3 | 3 |
| 4 | 6 |
| 5 | -15 |
| 6 | -3 |
| 7 | 48 |
| 8 | -39 |
| 9 | -105 |
| 10 | 222 |
| 11 | 93 |
| 12 | -759 |
| 13 | 480 |
| 14 | 1797 |
| 15 | -3237 |
| 16 | -2154 |
| 17 | 11865 |
| 18 | -5403 |
| 19 | -30192 |
| 20 | 46401 |
| 21 | 44175 |
| 22 | -183378 |
| 23 | 50853 |
| 24 | 499281 |
| 25 | -651840 |
| 26 | -846003 |
| 27 | 2801523 |
| 28 | -263514 |
| 29 | -8141055 |
| 30 | 8931597 |
| 31 | 15491568 |
| 32 | -42286359 |
| 33 | -4188345 |
| 34 | 131047422 |
| 35 | -118482387 |
| 36 | -274659879 |
| 37 | 630107040 |
| 38 | 193872597 |