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 | 1 |
| 2 | 5 |
| 3 | 37 |
| 4 | 481 |
| 5 | 10001 |
| 6 | 288901 |
| 7 | 10820965 |
| 8 | 511186817 |
| 9 | 29843419681 |
| 10 | 2106779832901 |
| 11 | 176180844038981 |
| 12 | 17165338119936865 |
| 13 | 1924030148121500017 |
| 14 | 245630480526435293381 |
| 15 | 35409038825312233143301 |
| 16 | 5719025066628373334423041 |
| 17 | 1027649751647068260334391105 |