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 | 19 |
| 3 | 131 |
| 4 | 139 |
| 5 | 649 |
| 6 | 3649 |
| 7 | 4181 |
| 8 | 5881 |
| 9 | 13369 |
| 10 | 29501 |
| 11 | 65789 |
| 12 | 37548761 |
| 13 | 63919409 |
| 14 | 2471800109 |