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 | 540 |
| 2 | 1751352 |
| 3 | 5386703316 |
| 4 | 16582103036544 |
| 5 | 51045000577926816 |
| 6 | 157132783947988296192 |
| 7 | 483704801377335372564480 |
| 8 | 1488997578825205151673656448 |
| 9 | 4583609224965381313988566950144 |