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) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 10 |
| 3 | 71 |
| 4 | 1925 |
| 5 | 203904 |
| 6 | 75214965 |
| 7 | 94608676477 |
| 8 | 409763735870986 |
| 9 | 6208539881584781823 |
| 10 | 334272186911271376874561 |
| 11 | 64832512634295914941490910360 |
| 12 | 45811927207957062190019240099653265 |