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 | 1 |
| 2 | 3 |
| 3 | 16 |
| 4 | 148 |
| 5 | 2400 |
| 6 | 62800 |
| 7 | 2150784 |
| 8 | 89051520 |
| 9 | 4376959488 |
| 10 | 264110948352 |