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 | 5 |
| 2 | 26 |
| 3 | 97 |
| 4 | 265 |
| 5 | 362 |
| 6 | -1351 |
| 7 | -13775 |
| 8 | -70226 |
| 9 | -262087 |
| 10 | -716035 |
| 11 | -978122 |
| 12 | 3650401 |
| 13 | 37220045 |
| 14 | 189750626 |
| 15 | 708158977 |
| 16 | 1934726305 |
| 17 | 2642885282 |
| 18 | -9863382151 |
| 19 | -100568547815 |
| 20 | -512706121226 |
| 21 | -1913445293767 |
| 22 | -5227629760075 |
| 23 | -7141075053842 |