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 | -38 |
| 2 | 646 |
| 3 | -6460 |
| 4 | 41990 |
| 5 | -184756 |
| 6 | 554268 |
| 7 | -1108536 |
| 8 | 1385670 |
| 9 | -923780 |
| 10 | 184756 |
| 11 | 33592 |
| 12 | 16796 |
| 13 | 12920 |
| 14 | 12920 |
| 15 | 15504 |
| 16 | 21318 |
| 17 | 32604 |
| 18 | 54340 |
| 19 | 97240 |
| 20 | 184756 |
| 21 | 369512 |
| 22 | 772616 |
| 23 | 1679600 |
| 24 | 3779100 |
| 25 | 8767512 |
| 26 | 20907144 |
| 27 | 51106352 |
| 28 | 127765880 |
| 29 | 326023280 |
| 30 | 847660528 |
| 31 | 2242198816 |