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 | 1 |
| 2 | 4 |
| 3 | 87 |
| 4 | 4239 |
| 5 | 385422 |
| 6 | 56304887 |
| 7 | 12069075787 |
| 8 | 3566873953872 |
| 9 | 1389853778362041 |
| 10 | 690363881963396569 |
| 11 | 425768137345317003930 |
| 12 | 319198739428765958327137 |
| 13 | 285884881894650500659218725 |
| 14 | 301473688731974642805982034540 |
| 15 | 369723877220104937359593829963363 |