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 | 6 |
| 4 | 10 |
| 5 | 36 |
| 6 | 168 |
| 7 | 1098 |
| 8 | 1204 |
| 9 | 2840 |
| 10 | 19488 |
| 11 | 1881124 |
| 12 | 3105700 |
| 13 | 445577184 |
| 14 | 105314212224 |
| 15 | 134633963520 |
| 16 | 2167649138304 |