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 | 12 |
| 3 | 60 |
| 4 | 364 |
| 5 | 2040 |
| 6 | 11640 |
| 7 | 75572 |
| 8 | 584306 |
| 9 | 5025774 |
| 10 | 44468794 |
| 11 | 392052540 |
| 12 | 3439315382 |
| 13 | 30250738752 |