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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 8 |
| 5 | 24 |
| 6 | 126 |
| 7 | 524 |
| 8 | 3072 |
| 9 | 22854 |
| 10 | 189646 |
| 11 | 1827114 |
| 12 | 19889946 |
| 13 | 238648524 |
| 14 | 3131979014 |
| 15 | 44540692612 |
| 16 | 681114241416 |
| 17 | 11136984461270 |