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 | 1 |
| 2 | 3 |
| 3 | 22 |
| 4 | 223 |
| 5 | 2792 |
| 6 | 42671 |
| 7 | 761984 |
| 8 | 15707707 |
| 9 | 365122688 |
| 10 | 9491746747 |
| 11 | 271962399232 |
| 12 | 8539383210711 |
| 13 | 290937486190592 |
| 14 | 10710312199270503 |
| 15 | 422984587596455936 |
| 16 | 17864076455770831219 |
| 17 | 802450164859200372736 |
| 18 | 38242916911507537149427 |
| 19 | 1925477163696152909447168 |
| 20 | 102213291475268656299164879 |