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 | 20 |
| 2 | 400 |
| 3 | 5172 |
| 4 | 65297 |
| 5 | 862652 |
| 6 | 11451149 |
| 7 | 151788273 |
| 8 | 2010430729 |
| 9 | 26638642226 |
| 10 | 353018801580 |
| 11 | 4678246752829 |
| 12 | 61995665582140 |
| 13 | 821565095555503 |
| 14 | 10887399620742611 |
| 15 | 144280214103179733 |
| 16 | 1912006322548221320 |