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 | 1 |
| 2 | 4 |
| 3 | 16 |
| 4 | 81 |
| 5 | 441 |
| 6 | 2601 |
| 7 | 16129 |
| 8 | 104329 |
| 9 | 697225 |
| 10 | 4787344 |
| 11 | 33616804 |
| 12 | 240591121 |
| 13 | 1750167225 |
| 14 | 12912685956 |
| 15 | 96454967184 |
| 16 | 728405920089 |
| 17 | 5554407254841 |
| 18 | 42724289649924 |
| 19 | 331213938112656 |