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 | 1 |
| 4 | 1 |
| 5 | 2 |
| 6 | 5 |
| 7 | 13 |
| 8 | 29 |
| 9 | 109 |
| 10 | 629 |
| 11 | 4274 |
| 12 | 23329 |
| 13 | 170353 |
| 14 | 2034385 |
| 15 | 35152177 |
| 16 | 494532481 |
| 17 | 7768108946 |
| 18 | 176258003381 |
| 19 | 7248370100941 |
| 20 | 266967020984381 |
| 21 | 9997125891977197 |
| 22 | 431397731193035525 |
| 23 | 38079906742644329378 |