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 | 2 |
| 2 | 7 |
| 3 | 59 |
| 4 | 1529 |
| 5 | 83313 |
| 6 | 7869898 |
| 7 | 1687054711 |
| 8 | 1123424582771 |
| 9 | 1662315215971057 |
| 10 | 4257998884448335457 |
| 11 | 23385756731869683322514 |
| 12 | 397068399296019032727466599 |
| 13 | 15886280085653574502219650145963 |
| 14 | 1107464108502549897934954766675333353 |
| 15 | 157131202095317153373302215985417166354641 |