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 | 3 |
| 3 | 14 |
| 4 | 53 |
| 5 | 195 |
| 6 | 727 |
| 7 | 2716 |
| 8 | 10137 |
| 9 | 37829 |
| 10 | 141179 |
| 11 | 526890 |
| 12 | 1966381 |
| 13 | 7338631 |
| 14 | 27388143 |
| 15 | 102213944 |
| 16 | 381467633 |
| 17 | 1423656585 |
| 18 | 5313158707 |
| 19 | 19828978246 |
| 20 | 74002754277 |
| 21 | 276182038859 |
| 22 | 1030725401159 |
| 23 | 3846719565780 |
| 24 | 14356152861961 |