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 | 0 |
| 2 | 25 |
| 3 | 2025 |
| 4 | 13225 |
| 5 | 4862025 |
| 6 | 60415182025 |
| 7 | 207612366025 |
| 8 | 153668543313582025 |
| 9 | 13876266042653742025 |
| 10 | 20761288044852366025 |
| 11 | 47285734107144405625 |
| 12 | 406066810454367265225 |
| 13 | 141704161680410868660551655625 |