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 | 3 |
| 2 | 11 |
| 3 | 59 |
| 4 | 251 |
| 5 | 1019 |
| 6 | 4091 |
| 7 | 262139 |
| 8 | 1048571 |
| 9 | 67108859 |
| 10 | 4294967291 |
| 11 | 68719476731 |
| 12 | 72057594037927931 |
| 13 | 73786976294838206459 |
| 14 | 332306998946228968225951765070086139 |
| 15 | 1361129467683753853853498429727072845819 |
| 16 | 1427247692705959881058285969449495136382746619 |