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 | 2 |
| 3 | 3 |
| 4 | 8 |
| 5 | 15 |
| 6 | 52 |
| 7 | 126 |
| 8 | 568 |
| 9 | 1782 |
| 10 | 10436 |
| 11 | 42471 |
| 12 | 323144 |
| 13 | 1706562 |
| 14 | 16866856 |
| 15 | 115640460 |
| 16 | 1484714416 |
| 17 | 13216815036 |
| 18 | 220426128584 |
| 19 | 2548124192970 |