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 | 625 |
| 2 | 62500 |
| 3 | 6250000 |
| 4 | 58140625 |
| 5 | 625000000 |
| 6 | 5814062500 |
| 7 | 6703515625 |
| 8 | 62500000000 |
| 9 | 581406250000 |
| 10 | 670351562500 |
| 11 | 6250000000000 |
| 12 | 58140625000000 |
| 13 | 67035156250000 |
| 14 | 539545791015625 |
| 15 | 625000000000000 |
| 16 | 5814062500000000 |
| 17 | 6703515625000000 |
| 18 | 53954579101562500 |