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 | 7 |
| 3 | 19 |
| 4 | 21 |
| 5 | 2703 |
| 6 | 15929 |
| 7 | 4124583 |
| 8 | 27067051 |
| 9 | 179992913 |
| 10 | 179993011 |
| 11 | 179993159 |
| 12 | 1208198559 |
| 13 | 1208198859 |
| 14 | 55762149031 |
| 15 | 382465573511 |
| 16 | 382465573547 |
| 17 | 18262325820337 |
| 18 | 6201265271239229 |
| 19 | 6201265271239409 |
| 20 | 6201265271239433 |
| 21 | 43525513764814941 |
| 22 | 43525513764816369 |
| 23 | 43525513764816411 |
| 24 | 43525513764816437 |
| 25 | 306268030480171419 |