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 | -1 |
| 3 | 23 |
| 4 | -16 |
| 5 | 5 |
| 6 | 165 |
| 7 | -177 |
| 8 | 111 |
| 9 | -27 |
| 10 | 3802 |
| 11 | -5548 |
| 12 | 5232 |
| 13 | -2548 |
| 14 | 502 |
| 15 | 21385 |
| 16 | -39615 |
| 17 | 49910 |
| 18 | -36490 |
| 19 | 14385 |
| 20 | -2375 |
| 21 | 993605 |
| 22 | -2235440 |
| 23 | 3527745 |
| 24 | -3441280 |
| 25 | 2035695 |
| 26 | -672360 |
| 27 | 95435 |