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 | 6 |
| 3 | 18 |
| 4 | 131 |
| 5 | 905 |
| 6 | 7582 |
| 7 | 65134 |
| 8 | 587682 |
| 9 | 5416897 |
| 10 | 50959134 |
| 11 | 486441796 |
| 12 | 4701644087 |
| 13 | 45911470685 |