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 | 3 |
| 2 | 27 |
| 3 | 101 |
| 4 | 239 |
| 5 | 21649 |
| 6 | 19 |
| 7 | 3191 |
| 8 | 35121409 |
| 9 | 722817036322379041 |
| 10 | 2241 |
| 11 | 797 |
| 12 | 967 |
| 13 | 1230610745978027 |
| 14 | 3373 |
| 15 | 60787 |
| 16 | 509538919 |
| 17 | 15060275578609 |
| 18 | 5779 |
| 19 | 37397 |
| 20 | 423557 |