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 | 1 |
| 3 | 1 |
| 4 | 4 |
| 5 | 9 |
| 6 | 49 |
| 7 | 529 |
| 8 | 3481 |
| 9 | 98596 |
| 10 | 2337841 |
| 11 | 67387681 |
| 12 | 6941055969 |
| 13 | 384768368209 |
| 14 | 61935294530404 |
| 15 | 16063784753682169 |
| 16 | 2846153597907293521 |
| 17 | 2237394491744632911601 |
| 18 | 1262082793174195430038441 |
| 19 | 1063198259901027900600665796 |