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 | 81 |
| 2 | 4913 |
| 3 | 317259 |
| 4 | 20780181 |
| 5 | 1366395515 |
| 6 | 89948464453 |
| 7 | 5923189816253 |
| 8 | 390086038882651 |
| 9 | 25690815631493191 |
| 10 | 1691995329032459285 |
| 11 | 111434983000652039093 |
| 12 | 7339124863989795685471 |
| 13 | 483355986017042494039859 |