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 | -47 |
| 3 | 505 |
| 4 | -2415 |
| 5 | 9661 |
| 6 | -23735 |
| 7 | -33487 |
| 8 | 237201 |
| 9 | -163277 |
| 10 | -454067 |
| 11 | 1069225 |
| 12 | -1219575 |
| 13 | -1155475 |
| 14 | 1573889 |
| 15 | 4878805 |
| 16 | 323217 |
| 17 | -13811867 |
| 18 | 7674019 |
| 19 | 21322841 |
| 20 | -23331315 |
| 21 | -16910935 |
| 22 | -50253575 |
| 23 | 37286545 |
| 24 | 119786505 |