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 | 577 |
| 3 | 153769 |
| 4 | 30856705 |
| 5 | 5388274121 |
| 6 | 868972410929 |
| 7 | 133267613878665 |
| 8 | 19752116290408897 |
| 9 | 2856738227918860537 |
| 10 | 405671453894948801169 |
| 11 | 56797093221062281961353 |
| 12 | 7862987107940658832635809 |
| 13 | 1078636993747832299068001753 |