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 | 3 |
| 3 | 5 |
| 4 | 15 |
| 5 | 137 |
| 6 | 4393 |
| 7 | 518625 |
| 8 | 239478123 |
| 9 | 455196345315 |
| 10 | 4054931519864889 |
| 11 | 157048983466046778713 |
| 12 | 33902817175022723879495899 |
| 13 | 33209307490198775518644207834495 |
| 14 | 202452250996395056747517509528867065999 |