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 | 6 |
| 2 | 57 |
| 3 | 368 |
| 4 | 1649 |
| 5 | 6250 |
| 6 | 23401 |
| 7 | 94932 |
| 8 | 423393 |
| 9 | 2012174 |
| 10 | 9865625 |
| 11 | 48989176 |
| 12 | 244389457 |
| 13 | 1221074418 |
| 14 | 6104053449 |
| 15 | 30518337500 |
| 16 | 152588939201 |
| 17 | 762940872982 |
| 18 | 3814699155193 |
| 19 | 19073488804224 |
| 20 | 95367434840625 |
| 21 | 476837162287226 |
| 22 | 2384185796169257 |
| 23 | 11920928961514468 |