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 | 2 |
| 2 | 9 |
| 3 | 20 |
| 4 | 149 |
| 5 | 467 |
| 6 | 237385 |
| 7 | 237852 |
| 8 | 1426645 |
| 9 | 7371077 |
| 10 | 8797722 |
| 11 | 16168799 |
| 12 | 24966521 |
| 13 | 66101841 |
| 14 | 91068362 |
| 15 | 157170203 |
| 16 | 3863153234 |
| 17 | 4020323437 |
| 18 | 7883476671 |
| 19 | 11903800108 |
| 20 | 43594876995 |
| 21 | 142688431093 |
| 22 | 4324247809785 |
| 23 | 17439679670233 |
| 24 | 178721044512115 |
| 25 | 28255364712584403 |