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 | 6 |
| 2 | 146 |
| 3 | 4332 |
| 4 | 135954 |
| 5 | 4395456 |
| 6 | 144840476 |
| 7 | 4836766584 |
| 8 | 163112472594 |
| 9 | 5542414273884 |
| 10 | 189456975899496 |
| 11 | 6507792553644256 |
| 12 | 224442843729333276 |
| 13 | 7766945604528200460 |
| 14 | 269557528994032024080 |
| 15 | 9378595792117360310832 |