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) |
|---|---|
| 1 | 7 |
| 2 | 19 |
| 3 | 73 |
| 4 | 2161 |
| 5 | 15121 |
| 6 | 1088641 |
| 7 | 10886401 |
| 8 | 18681062401 |
| 9 | 77556050216654929920001 |
| 10 | 46533630129992957952000001 |
| 11 | 789392510801080590501654036480000001 |