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 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 37 |
| 5 | 602 |
| 6 | 34126 |
| 7 | 6021463 |
| 8 | 3616906549 |
| 9 | 7361925161868 |
| 10 | 51324462383008758 |
| 11 | 1240420936122453106498 |
| 12 | 105141919479926837860474091 |
| 13 | 31581183353539008502807807352728 |