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 | 7 |
| 3 | 62 |
| 4 | 508 |
| 5 | 1048448 |
| 6 | 134216704 |
| 7 | 1073739776 |
| 8 | 9007199250546688 |
| 9 | 5192296858534827626278696515534848 |
| 10 | 187072209578355573530071658285452771612302071824384 |