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 | 2 |
| 3 | 21 |
| 4 | 724 |
| 5 | 75695 |
| 6 | 23694838 |
| 7 | 22239639177 |
| 8 | 62747494950248 |
| 9 | 532868670719193651 |
| 10 | 13624738004791751175370 |
| 11 | 1048678107774203901392276461 |
| 12 | 242892250870416811233766661498812 |