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 | 358 |
| 6 | 4468 |
| 7 | 88056 |
| 8 | 2745186 |
| 9 | 134355866 |
| 10 | 10264692132 |
| 11 | 1234801357470 |
| 12 | 232966546265096 |
| 13 | 68939282741912248 |