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 | 7 |
| 2 | 58 |
| 3 | 532 |
| 4 | 5209 |
| 5 | 53347 |
| 6 | 564499 |
| 7 | 6123481 |
| 8 | 67732483 |
| 9 | 761052565 |
| 10 | 8662502212 |
| 11 | 99671232514 |
| 12 | 1157409133831 |
| 13 | 13546774268125 |
| 14 | 159649564550746 |
| 15 | 1892849564159596 |
| 16 | 22562032457415067 |
| 17 | 270209749616920813 |
| 18 | 3249905798884688038 |
| 19 | 39237866746912398292 |
| 20 | 475388228365424562019 |