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 | 25 |
| 1 | 251 |
| 2 | 12575 |
| 3 | 126001 |
| 4 | 6312625 |
| 5 | 63252251 |
| 6 | 3168925175 |
| 7 | 31752504001 |
| 8 | 1590794125225 |
| 9 | 15939693756251 |
| 10 | 798575481937775 |
| 11 | 8001694513134001 |
| 12 | 400883301138637825 |
| 13 | 4016834705899512251 |
| 14 | 201242618596114250375 |