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 | 3 |
| 2 | 8 |
| 3 | 24 |
| 4 | 95 |
| 5 | 472 |
| 6 | 3010 |
| 7 | 22508 |
| 8 | 198157 |
| 9 | 1969757 |
| 10 | 22006039 |
| 11 | 272436985 |
| 12 | 3691859826 |
| 13 | 54696947677 |
| 14 | 872698586012 |
| 15 | 15055534230363 |
| 16 | 276756250035637 |
| 17 | 5449734493500830 |
| 18 | 113510195694700702 |
| 19 | 2512765185249336397 |