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 | 4 |
| 2 | 49 |
| 3 | 400 |
| 4 | 4096 |
| 5 | 40000 |
| 6 | 400689 |
| 7 | 4000000 |
| 8 | 40005625 |
| 9 | 400000000 |
| 10 | 4000056516 |
| 11 | 40000000000 |
| 12 | 400000591936 |
| 13 | 4000000000000 |
| 14 | 40000008597136 |
| 15 | 400000000000000 |
| 16 | 4000000100766916 |
| 17 | 40000000000000000 |
| 18 | 400000001222314089 |
| 19 | 4000000000000000000 |
| 20 | 40000000008389413041 |