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 | 1 |
| 3 | 5 |
| 4 | 25 |
| 5 | 625 |
| 6 | 9376 |
| 7 | 90625 |
| 8 | 890625 |
| 9 | 7109376 |
| 10 | 12890625 |
| 11 | 212890625 |
| 12 | 1787109376 |
| 13 | 81787109376 |
| 14 | 59918212890625 |
| 15 | 259918212890625 |
| 16 | 3740081787109376 |
| 17 | 56259918212890625 |
| 18 | 256259918212890625 |
| 19 | 7743740081787109376 |