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 | 0 |
| 2 | 1 |
| 3 | -2 |
| 4 | 3 |
| 5 | 1 |
| 6 | -24 |
| 7 | 14 |
| 8 | 9 |
| 9 | 1 |
| 10 | -288 |
| 11 | 54 |
| 12 | 95 |
| 13 | 18 |
| 14 | 1 |
| 15 | -4320 |
| 16 | -136 |
| 17 | 1110 |
| 18 | 315 |
| 19 | 30 |
| 20 | 1 |
| 21 | -80640 |
| 22 | -12300 |
| 23 | 15064 |
| 24 | 5775 |
| 25 | 775 |
| 26 | 45 |
| 27 | 1 |