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 | 121 |
| 2 | 1563 |
| 3 | 8403 |
| 4 | 29525 |
| 5 | 80525 |
| 6 | 185647 |
| 7 | 379687 |
| 8 | 709929 |
| 9 | 1238049 |
| 10 | 2042051 |
| 11 | 3218171 |
| 12 | 4882813 |
| 13 | 7174453 |
| 14 | 10255575 |
| 15 | 14314575 |
| 16 | 19567697 |
| 17 | 26260937 |
| 18 | 34671979 |
| 19 | 45112099 |
| 20 | 57928101 |
| 21 | 73504221 |
| 22 | 92264063 |
| 23 | 114672503 |
| 24 | 141237625 |
| 25 | 172512625 |