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 | 6 |
| 3 | 9 |
| 4 | 9 |
| 5 | 0 |
| 6 | -26 |
| 7 | -72 |
| 8 | -117 |
| 9 | -82 |
| 10 | 204 |
| 11 | 975 |
| 12 | 2289 |
| 13 | 3357 |
| 14 | 1332 |
| 15 | -9834 |
| 16 | -37935 |
| 17 | -82593 |
| 18 | -108282 |
| 19 | 2583 |
| 20 | 487521 |
| 21 | 1621071 |
| 22 | 3261546 |
| 23 | 3685230 |
| 24 | -2318615 |
| 25 | -24607854 |
| 26 | -72887472 |
| 27 | -134909701 |
| 28 | -123941901 |
| 29 | 200330184 |
| 30 | 1258932996 |
| 31 | 3377359872 |
| 32 | 5706502677 |
| 33 | 3797618237 |