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 | 8 |
| 4 | 66 |
| 5 | 774 |
| 6 | 11885 |
| 7 | 230858 |
| 8 | 5512821 |
| 9 | 157926273 |
| 10 | 5323010347 |
| 11 | 207833183972 |
| 12 | 9280406921629 |
| 13 | 468879370270319 |
| 14 | 26561064972285450 |
| 15 | 1673867356632729422 |
| 16 | 116555375609273658636 |
| 17 | 8914259769349445083676 |
| 18 | 744876885721366948399627 |