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 | 3 |
| 3 | 13 |
| 4 | 15 |
| 5 | 69 |
| 6 | 73 |
| 7 | 637321 |
| 8 | 27066989 |
| 9 | 27067095 |
| 10 | 27067133 |
| 11 | 179992909 |
| 12 | 1208198629 |
| 13 | 1208198853 |
| 14 | 8179002209 |
| 15 | 382465573515 |
| 16 | 2636913003191 |
| 17 | 18262325820323 |
| 18 | 18262325820339 |
| 19 | 6201265271239163 |
| 20 | 6201265271239191 |
| 21 | 6201265271239431 |
| 22 | 43525513764815041 |
| 23 | 43525513764815125 |