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 | 2 |
| 2 | 6 |
| 3 | 84 |
| 4 | 20475 |
| 5 | 234531275 |
| 6 | 199200973555045 |
| 7 | 16481425431663122588749 |
| 8 | 173392935733620216899469862542865 |
| 9 | 300717095810709134168380432250652303057474577 |