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 | 5 |
| 2 | 17 |
| 3 | 53 |
| 4 | 3545 |
| 5 | 8369 |
| 6 | 823633 |
| 7 | 499025 |
| 8 | 669937733 |
| 9 | 722651597 |
| 10 | 35034942905 |
| 11 | 173113684537 |
| 12 | 1860490554949 |
| 13 | 21906189996125 |
| 14 | 2320160748906089 |
| 15 | 1347255903779016125 |
| 16 | 49174444344033218405 |
| 17 | 436006592777392918253129 |
| 18 | 31471103940926430492910889 |