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 | 13 |
| 3 | 169 |
| 4 | 2197 |
| 5 | 28561 |
| 6 | 371293 |
| 7 | 2684903 |
| 8 | 4826809 |
| 9 | 34903739 |
| 10 | 62748517 |
| 11 | 257734633 |
| 12 | 453748607 |
| 13 | 815730721 |
| 14 | 3185696137 |
| 15 | 3350550229 |
| 16 | 5898731891 |
| 17 | 10604499373 |
| 18 | 41414049781 |
| 19 | 42655053961 |
| 20 | 43557152977 |
| 21 | 76683514583 |