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 | 55 |
| 4 | 1077 |
| 5 | 32951 |
| 6 | 1451723 |
| 7 | 87054773 |
| 8 | 6818444405 |
| 9 | 675900963271 |
| 10 | 82717196780955 |
| 11 | 12248810651651333 |
| 12 | 2158585005685222491 |
| 13 | 446445657799551807541 |
| 14 | 107087164031952038620481 |
| 15 | 29487141797206760561836055 |
| 16 | 9238158011747884080353808245 |