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 | 2 |
| 3 | 5 |
| 4 | 14 |
| 5 | 43 |
| 6 | 143 |
| 7 | 509 |
| 8 | 1922 |
| 9 | 7651 |
| 10 | 31965 |
| 11 | 139685 |
| 12 | 636712 |
| 13 | 3020203 |
| 14 | 14878176 |
| 15 | 75982829 |
| 16 | 401654560 |
| 17 | 2194564531 |
| 18 | 12377765239 |
| 19 | 71980880885 |
| 20 | 431114329728 |
| 21 | 2656559925883 |
| 22 | 16825918195484 |
| 23 | 109439943234749 |
| 24 | 730365368850192 |