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 | 5 |
| 5 | 17 |
| 6 | 79 |
| 7 | 421 |
| 8 | 2537 |
| 9 | 16214 |
| 10 | 108204 |
| 11 | 743953 |
| 12 | 5237414 |
| 13 | 37574426 |
| 14 | 273889801 |
| 15 | 2023645764 |
| 16 | 15128049989 |
| 17 | 114256903169 |
| 18 | 870786692493 |
| 19 | 6690155544157 |
| 20 | 51771411793812 |
| 21 | 403238508004050 |
| 22 | 3159259746188665 |
| 23 | 24884525271410389 |
| 24 | 196966954270163612 |