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 | 7 |
| 2 | 47 |
| 3 | 223 |
| 4 | 3967 |
| 5 | 16127 |
| 6 | 1046527 |
| 7 | 16769023 |
| 8 | 1073676287 |
| 9 | 68718952447 |
| 10 | 274876858367 |
| 11 | 4398042316799 |
| 12 | 1125899839733759 |
| 13 | 18014398241046527 |
| 14 | 1298074214633706835075030044377087 |