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 | 21 |
| 3 | 63 |
| 4 | 291 |
| 5 | 2744 |
| 6 | 2991 |
| 7 | 6102 |
| 8 | 6711 |
| 9 | 46676013 |
| 10 | 69460293 |
| 11 | 272543398 |
| 12 | 896172631 |