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 | 0 |
| 2 | 1 |
| 3 | 10 |
| 4 | 53 |
| 5 | 390 |
| 6 | 2794 |
| 7 | 21215 |
| 8 | 167055 |
| 9 | 1347999 |
| 10 | 11084015 |
| 11 | 92708718 |
| 12 | 786663767 |
| 13 | 6757618852 |