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 | 421 |
| 4 | 1541 |
| 5 | 8753 |
| 6 | 150421 |
| 7 | 12914246 |
| 8 | 1327696379533 |
| 9 | 4034385661121 |
| 10 | 605166395826533 |
| 11 | 16360402306368458 |
| 12 | 249752330575267378 |