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 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 8 |
| 5 | 33 |
| 6 | 194 |
| 7 | 1196 |
| 8 | 8196 |
| 9 | 58140 |
| 10 | 427975 |
| 11 | 3223610 |
| 12 | 24780752 |
| 13 | 193610550 |
| 14 | 1534060440 |
| 15 | 12302123640 |
| 16 | 99699690472 |
| 17 | 815521503060 |
| 18 | 6725991120004 |
| 19 | 55882668179880 |
| 20 | 467387136083296 |
| 21 | 3932600361607809 |
| 22 | 33269692212847056 |
| 23 | 282863689410850236 |
| 24 | 2415930985594609548 |