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 | 5 |
| 2 | 25 |
| 3 | 125 |
| 4 | 625 |
| 5 | 3124 |
| 6 | 15615 |
| 7 | 78050 |
| 8 | 390125 |
| 9 | 1950000 |
| 10 | 9746876 |
| 11 | 48718765 |
| 12 | 243515775 |
| 13 | 1217188750 |
| 14 | 6083993750 |
| 15 | 30410221874 |
| 16 | 152002390605 |
| 17 | 759768437250 |
| 18 | 3797624997500 |
| 19 | 18982040993750 |
| 20 | 94879794746876 |
| 21 | 474246971343775 |