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) |
|---|---|
| 1 | 1 |
| 2 | 10 |
| 3 | 82 |
| 4 | 739 |
| 5 | 6562 |
| 6 | 59140 |
| 7 | 531442 |
| 8 | 4783708 |
| 9 | 43046803 |
| 10 | 387427060 |
| 11 | 3486784402 |
| 12 | 31381119478 |
| 13 | 282429536482 |
| 14 | 2541866359780 |
| 15 | 22876792461604 |
| 16 | 205891136878357 |
| 17 | 1853020188851842 |
| 18 | 16677181742772430 |
| 19 | 150094635296999122 |
| 20 | 1350851718060419878 |
| 21 | 12157665459057460324 |