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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 29 |
| 5 | 108 |
| 6 | 941 |
| 7 | 4582 |
| 8 | 32689 |
| 9 | 179928 |
| 10 | 1177081 |
| 11 | 6852362 |
| 12 | 43131749 |
| 13 | 257572548 |
| 14 | 1593438821 |
| 15 | 9626191342 |
| 16 | 59088353209 |
| 17 | 358831489968 |
| 18 | 2194871810161 |
| 19 | 13360530869522 |
| 20 | 81592856993069 |
| 21 | 497198985724188 |
| 22 | 3034219396275101 |