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 | 1 |
| 2 | 5 |
| 3 | 25 |
| 4 | 125 |
| 5 | 625 |
| 6 | 1555 |
| 7 | 3125 |
| 8 | 7775 |
| 9 | 15625 |
| 10 | 38875 |
| 11 | 78125 |
| 12 | 194375 |
| 13 | 390625 |
| 14 | 483605 |
| 15 | 971875 |
| 16 | 1953125 |
| 17 | 2418025 |
| 18 | 4859375 |
| 19 | 9673655 |
| 20 | 9765625 |
| 21 | 12090125 |
| 22 | 24296875 |
| 23 | 48368275 |
| 24 | 48828125 |
| 25 | 60450625 |
| 26 | 120909025 |
| 27 | 121484375 |
| 28 | 150401155 |
| 29 | 241841375 |