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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 7 |
| 3 | 73 |
| 4 | 1015 |
| 5 | 17641 |
| 6 | 367927 |
| 7 | 8952553 |
| 8 | 248956855 |
| 9 | 7788499561 |
| 10 | 270732878647 |
| 11 | 10351919533033 |
| 12 | 431806658432695 |
| 13 | 19512813265643881 |
| 14 | 949587798053709367 |
| 15 | 49512355251796513513 |
| 16 | 2753726282896986372535 |
| 17 | 162725978752448205162601 |