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 | -22 |
| 3 | 207 |
| 4 | -1036 |
| 5 | 2551 |
| 6 | 90 |
| 7 | -19115 |
| 8 | 46160 |
| 9 | -2208 |
| 10 | -166496 |
| 11 | 203828 |
| 12 | 203208 |
| 13 | -375150 |
| 14 | -551652 |
| 15 | 489006 |
| 16 | 2516800 |
| 17 | -2361340 |
| 18 | -4512048 |
| 19 | 3998664 |
| 20 | 5399616 |
| 21 | 2581080 |
| 22 | -13068144 |
| 23 | -10074096 |
| 24 | 14208912 |
| 25 | 12992695 |
| 26 | 25642190 |
| 27 | -34987395 |
| 28 | -70969812 |
| 29 | 21454401 |
| 30 | 84666774 |
| 31 | 95035979 |