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 | 21 |
| 2 | 6272 |
| 3 | 880163 |
| 4 | 152526845 |
| 5 | 24972353440 |
| 6 | 4161756233501 |
| 7 | 690427159718433 |
| 8 | 114725843769441312 |
| 9 | 19056798015394695543 |
| 10 | 3165986817537284900809 |
| 11 | 525966380704787334395776 |
| 12 | 87380576637559587656345353 |
| 13 | 14516824056706613915897809761 |
| 14 | 2411733911295546238838103099168 |