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 | 2 |
| 3 | -2 |
| 4 | 11 |
| 5 | -12 |
| 6 | 2 |
| 7 | 52 |
| 8 | -70 |
| 9 | 20 |
| 10 | -2 |
| 11 | 269 |
| 12 | -392 |
| 13 | 150 |
| 14 | -28 |
| 15 | 2 |
| 16 | 1414 |
| 17 | -2186 |
| 18 | 1000 |
| 19 | -262 |
| 20 | 36 |
| 21 | -2 |