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 | 7 |
| 4 | 97 |
| 5 | 331 |
| 6 | 77089 |
| 7 | 562609 |
| 8 | 19352053463 |
| 9 | 6781959158383 |
| 10 | 4060488497950626661 |
| 11 | 2877117441205884350399 |
| 12 | 7936150834464388482084637351 |
| 13 | 21924183158935156780838459 |