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 | 25 |
| 2 | 575 |
| 3 | 12075 |
| 4 | 230025 |
| 5 | 3969225 |
| 6 | 62850375 |
| 7 | 953260875 |
| 8 | 14929952625 |
| 9 | 254408009625 |
| 10 | 4570418955375 |
| 11 | 82108573036875 |
| 12 | 1505493410045625 |
| 13 | 30038848390175625 |
| 14 | 641671899357864375 |
| 15 | 13683270472813816875 |