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 | 21 |
| 2 | 441 |
| 3 | 5238 |
| 4 | 50024 |
| 5 | 532565 |
| 6 | 6110500 |
| 7 | 69943253 |
| 8 | 783072552 |
| 9 | 8759983583 |
| 10 | 98440457351 |
| 11 | 1108879339651 |
| 12 | 12480666817260 |
| 13 | 140421583259356 |
| 14 | 1580016922218493 |
| 15 | 17782853849081975 |
| 16 | 200149452833682454 |