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 | 12 |
| 3 | 29 |
| 4 | 78 |
| 5 | 199 |
| 6 | 508 |
| 7 | 1355 |
| 8 | 3592 |
| 9 | 9589 |
| 10 | 25752 |
| 11 | 70579 |
| 12 | 194228 |
| 13 | 539961 |
| 14 | 1507602 |
| 15 | 4228745 |
| 16 | 11913940 |
| 17 | 33690443 |
| 18 | 95581182 |
| 19 | 272003821 |
| 20 | 776082524 |
| 21 | 2219823175 |
| 22 | 6363074656 |