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 | 5 |
| 2 | 29 |
| 3 | 217 |
| 4 | 2297 |
| 5 | 34349 |
| 6 | 674965 |
| 7 | 16276481 |
| 8 | 461527793 |
| 9 | 14993138773 |
| 10 | 548258687501 |
| 11 | 22272738733865 |
| 12 | 994870668959209 |
| 13 | 48451779617935997 |
| 14 | 2554818339078836357 |
| 15 | 144990720049391354449 |
| 16 | 8811240401831517313505 |
| 17 | 570857963393730507892901 |
| 18 | 39275973938444154366908413 |