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 | 2 |
| 2 | 139 |
| 3 | 1627 |
| 4 | 18839 |
| 5 | 123229 |
| 6 | 776257 |
| 7 | 3873011 |
| 8 | 23884639 |
| 9 | 36539311 |
| 10 | 196943081 |
| 11 | 452942827 |
| 12 | 73712513057 |
| 13 | 154351758091 |
| 14 | 154351758091 |
| 15 | 4010803176619 |
| 16 | 6987191424553 |
| 17 | 71894236537009 |
| 18 | 196948379177587 |
| 19 | 253931039382791 |