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 | 10 |
| 4 | 18 |
| 5 | 70 |
| 6 | 585 |
| 7 | 921 |
| 8 | 1943 |
| 9 | 4635 |
| 10 | 13543 |
| 11 | 13803 |
| 12 | 15938 |
| 13 | 39004 |