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 | 2 |
| 2 | 22 |
| 3 | 764 |
| 4 | 152404 |
| 5 | 99869288 |
| 6 | 377566978168 |
| 7 | 4699193672889776 |
| 8 | 337505849373783995536 |
| 9 | 79809726992391397235470112 |
| 10 | 108909145140488785290568540059232 |
| 11 | 489318942025571053898957586140666992064 |
| 12 | 12686855492437023425546597742222336158113232704 |