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 | 24 |
| 5 | 114 |
| 6 | 647 |
| 7 | 3883 |
| 8 | 24605 |
| 9 | 159837 |
| 10 | 1060450 |
| 11 | 7137627 |
| 12 | 48624639 |
| 13 | 334475495 |
| 14 | 2319909330 |
| 15 | 16205238283 |