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 | 2 |
| 2 | 5 |
| 3 | 17 |
| 4 | 71 |
| 5 | 317 |
| 6 | 1415 |
| 7 | 6197 |
| 8 | 26591 |
| 9 | 112157 |
| 10 | 466775 |
| 11 | 1923077 |
| 12 | 7863311 |
| 13 | 31972397 |
| 14 | 129459335 |
| 15 | 522571157 |
| 16 | 2104535231 |
| 17 | 8460991037 |
| 18 | 33972711095 |
| 19 | 136277478437 |
| 20 | 546270602351 |
| 21 | 2188566048077 |
| 22 | 8764718254055 |
| 23 | 35090241492917 |