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 | 21 |
| 4 | 261 |
| 5 | 4919 |
| 6 | 120096 |
| 7 | 3558888 |
| 8 | 123026475 |
| 9 | 4817478608 |
| 10 | 209081118730 |
| 11 | 9892111117243 |