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) |
|---|---|
| 0 | 21 |
| 1 | 9261 |
| 2 | 4084101 |
| 3 | 1801088541 |
| 4 | 794280046581 |
| 5 | 350277500542221 |
| 6 | 154472377739119461 |
| 7 | 68122318582951682301 |
| 8 | 30041942495081691894741 |
| 9 | 13248496640331026125580781 |
| 10 | 5842587018385982521381124421 |
| 11 | 2576580875108218291929075869661 |
| 12 | 1136272165922724266740722458520501 |