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 | 1 |
| 2 | 1 |
| 3 | 5 |
| 4 | 19 |
| 5 | 89 |
| 6 | 410 |
| 7 | 2052 |
| 8 | 10440 |
| 9 | 54874 |
| 10 | 293549 |
| 11 | 1597621 |
| 12 | 8807766 |
| 13 | 49107289 |
| 14 | 276358791 |
| 15 | 1567866228 |
| 16 | 8957204966 |
| 17 | 51486464912 |
| 18 | 297548288251 |
| 19 | 1727856600935 |
| 20 | 10076859047404 |
| 21 | 58996263573440 |
| 22 | 346614270372761 |
| 23 | 2042929868812385 |
| 24 | 12076076910981403 |