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 | 4 |
| 2 | 21 |
| 3 | 168 |
| 4 | 1865 |
| 5 | 26348 |
| 6 | 450205 |
| 7 | 9011152 |
| 8 | 206624529 |
| 9 | 5338349652 |
| 10 | 153408637349 |
| 11 | 4853054571896 |
| 12 | 167576795780953 |
| 13 | 6271355892192316 |
| 14 | 252836327218276653 |
| 15 | 10924378168890333600 |
| 16 | 503589353964709474337 |
| 17 | 24669610145575233317540 |