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 | 3 |
| 2 | 23 |
| 3 | 99 |
| 4 | 420 |
| 5 | 1807 |
| 6 | 8287 |
| 7 | 40017 |
| 8 | 202208 |
| 9 | 1059807 |
| 10 | 5736717 |
| 11 | 31911465 |
| 12 | 182019293 |
| 13 | 1060723057 |