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 | 1 |
| 2 | 1 |
| 3 | 5 |
| 4 | 23 |
| 5 | 151 |
| 6 | 1141 |
| 7 | 10205 |
| 8 | 103823 |
| 9 | 1190191 |
| 10 | 15151981 |
| 11 | 212222405 |
| 12 | 3242472023 |
| 13 | 53670028231 |
| 14 | 956685677221 |
| 15 | 18271360434605 |
| 16 | 372221031054623 |
| 17 | 8056751598834271 |
| 18 | 184647141575344861 |
| 19 | 4466900836910758805 |