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 | 107 |
| 4 | 1367 |
| 5 | 31397 |
| 6 | 910457 |
| 7 | 33686837 |
| 8 | 1448533907 |
| 9 | 88360568207 |
| 10 | 6450321478967 |
| 11 | 574078611627887 |
| 12 | 78648769793020247 |
| 13 | 11875964238746056997 |
| 14 | 1983286027870591518167 |
| 15 | 394673919546247712114837 |