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 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 9 |
| 5 | 29 |
| 6 | 113 |
| 7 | 613 |
| 8 | 3033 |
| 9 | 17010 |
| 10 | 110929 |
| 11 | 713249 |
| 12 | 5061097 |
| 13 | 38762873 |
| 14 | 302389553 |
| 15 | 2544613578 |
| 16 | 22404995001 |
| 17 | 203762678941 |
| 18 | 1960880744337 |
| 19 | 19509713674397 |
| 20 | 201306862742217 |
| 21 | 2166901479447194 |
| 22 | 24018963506471921 |
| 23 | 275731857268608673 |
| 24 | 3271769647891351705 |