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 | 7701 |
| 3 | 219781 |
| 4 | 1789106881 |
| 5 | 51059956641 |
| 6 | 415648888795141 |
| 7 | 11862351246525781 |
| 8 | 96564381140875635681 |
| 9 | 2755885166244302532001 |
| 10 | 22434030154994860543881301 |
| 11 | 640252753580346501593005701 |
| 12 | 5211918753572151610134715970401 |
| 13 | 148744800214537374776845967930881 |