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 | 0 |
| 1 | 5 |
| 2 | 25 |
| 3 | 375 |
| 4 | 625 |
| 5 | 59375 |
| 6 | 390625 |
| 7 | 859375 |
| 8 | 62890625 |
| 9 | 443359375 |
| 10 | 6650390625 |
| 11 | 49755859375 |
| 12 | 746337890625 |
| 13 | 6195068359375 |
| 14 | 92926025390625 |
| 15 | 893890380859375 |
| 16 | 8408355712890625 |
| 17 | 26125335693359375 |
| 18 | 891880035400390625 |
| 19 | 8378200531005859375 |
| 20 | 25673007965087890625 |