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 | 2 |
| 1 | 5 |
| 2 | 7 |
| 3 | -26 |
| 4 | -265 |
| 5 | -1351 |
| 6 | -5042 |
| 7 | -13775 |
| 8 | -18817 |
| 9 | 70226 |
| 10 | 716035 |
| 11 | 3650401 |
| 12 | 13623482 |
| 13 | 37220045 |
| 14 | 50843527 |
| 15 | -189750626 |
| 16 | -1934726305 |
| 17 | -9863382151 |
| 18 | -36810643322 |
| 19 | -100568547815 |
| 20 | -137379191137 |
| 21 | 512706121226 |
| 22 | 5227629760075 |
| 23 | 26650854921601 |