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 | 1 |
| 2 | 5 |
| 3 | 39 |
| 4 | 2023 |
| 5 | 249651 |
| 6 | 128938297 |
| 7 | 207866584389 |
| 8 | 1208344842789831 |
| 9 | 23649239068131551559 |
| 10 | 1609120545126107661426575 |
| 11 | 375082120094104660413783094451 |
| 12 | 301522432794951154854984388046484015 |
| 13 | 833441700776362178606942848178200903068675 |
| 14 | 7931715551857283775957120938092133944383839378911 |