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 | 2 |
| 2 | 6 |
| 3 | 66 |
| 4 | 1418 |
| 5 | 83074 |
| 6 | 11181454 |
| 7 | 3709621842 |
| 8 | 2950299178242 |
| 9 | 5681245408101350 |
| 10 | 26398983976826626170 |