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 | 11 |
| 2 | 3 |
| 3 | 2 |
| 4 | 509 |
| 5 | 2 |
| 6 | 89 |
| 7 | 16651 |
| 8 | 15514861 |
| 9 | 85864769 |
| 10 | 26089808579 |
| 11 | 665043081119 |
| 12 | 554688278429 |
| 13 | 758083947856951 |
| 14 | 95405042230542329 |
| 15 | 69257563144280941 |