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 | 0 |
| 1 | 5 |
| 2 | 17 |
| 3 | 100 |
| 4 | 791 |
| 5 | 5830 |
| 6 | 42468 |
| 7 | 327198 |
| 8 | 2575838 |
| 9 | 20476640 |
| 10 | 166554645 |
| 11 | 1353822880 |
| 12 | 11150031169 |
| 13 | 92258920888 |
| 14 | 769310640408 |
| 15 | 6447635236133 |
| 16 | 54292816788848 |
| 17 | 459112338326268 |
| 18 | 3896226837717653 |
| 19 | 33172345145637461 |
| 20 | 283258796052356059 |
| 21 | 2425130743589880412 |
| 22 | 20812174068479995267 |