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 | 624 |
| 3 | 15575 |
| 4 | 388751 |
| 5 | 9703200 |
| 6 | 242191249 |
| 7 | 6045078025 |
| 8 | 150884759376 |
| 9 | 3766073906375 |
| 10 | 94000962899999 |
| 11 | 2346257998593600 |
| 12 | 58562449001940001 |
| 13 | 1461714967049906425 |
| 14 | 36484311727245720624 |
| 15 | 910646078214093109175 |