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 | -1 |
| 2 | -16 |
| 3 | -65 |
| 4 | -79 |
| 5 | 831 |
| 6 | 4789 |
| 7 | 15099 |
| 8 | 6450 |
| 9 | -162454 |
| 10 | -922222 |
| 11 | -2766802 |
| 12 | -2885883 |
| 13 | 17436735 |
| 14 | 123724783 |
| 15 | 429826690 |
| 16 | 823702295 |
| 17 | -482288111 |
| 18 | -11124249861 |
| 19 | -50746426204 |
| 20 | -140257438535 |
| 21 | -188609543978 |
| 22 | 446818695084 |
| 23 | 4049784546745 |
| 24 | 15671762002156 |