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 | 4 |
| 2 | 42 |
| 3 | 813 |
| 4 | 22519 |
| 5 | 811368 |
| 6 | 35946076 |
| 7 | 1888624972 |
| 8 | 114746269758 |
| 9 | 7912720985079 |
| 10 | 610470884770406 |
| 11 | 52094956940751710 |
| 12 | 4871691779130290166 |
| 13 | 495409898474358881327 |
| 14 | 54427906182810588386674 |
| 15 | 6424384909407981686846705 |