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 | 24 |
| 3 | 100 |
| 4 | 422 |
| 5 | 2936 |
| 6 | 17899 |
| 7 | 104985 |
| 8 | 645568 |
| 9 | 3978117 |
| 10 | 24326196 |
| 11 | 149160149 |
| 12 | 916286494 |
| 13 | 5624456404 |
| 14 | 34523088073 |
| 15 | 211969293298 |
| 16 | 1301435980104 |
| 17 | 7990173493126 |
| 18 | 49057461019439 |
| 19 | 301200758005780 |
| 20 | 1849287533799779 |