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 | 5 |
| 3 | 76 |
| 4 | 2392 |
| 5 | 126676 |
| 6 | 10057204 |
| 7 | 1114096320 |
| 8 | 163918005696 |
| 9 | 30894047577216 |
| 10 | 7254176241285504 |
| 11 | 2075722128162164736 |
| 12 | 710883208780304954112 |
| 13 | 287061726161439955116288 |
| 14 | 134961239570613490548986112 |
| 15 | 73079781978184515947237031936 |
| 16 | 45150931601954398539342470578176 |