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 | 10 |
| 4 | 42 |
| 5 | 589 |
| 6 | 2186 |
| 7 | 30253 |
| 8 | 113307 |
| 9 | 1608668 |
| 10 | 88157689 |
| 11 | 336717854 |
| 12 | 19015826478 |
| 13 | 282528883551 |
| 14 | 1091574618496 |
| 15 | 16360940729894 |