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 | 5 |
| 2 | 25 |
| 3 | 125 |
| 4 | 625 |
| 5 | 3125 |
| 6 | 15625 |
| 7 | 8125 |
| 8 | 40625 |
| 9 | 203125 |
| 10 | 1015625 |
| 11 | 508125 |
| 12 | 2540625 |
| 13 | 1203125 |
| 14 | 6015625 |
| 15 | 3008125 |
| 16 | 15040625 |
| 17 | 5203125 |
| 18 | 26015625 |
| 19 | 13008125 |
| 20 | 65040625 |
| 21 | 325203125 |
| 22 | 1626015625 |
| 23 | 813008125 |
| 24 | 4065040625 |
| 25 | 20325203125 |
| 26 | 101626015625 |
| 27 | 50813008125 |
| 28 | 254065040625 |