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 | 3 |
| 1 | 24 |
| 2 | 194 |
| 3 | 1584 |
| 4 | 13058 |
| 5 | 108624 |
| 6 | 911234 |
| 7 | 7703664 |
| 8 | 65588738 |
| 9 | 561991824 |
| 10 | 4843001474 |
| 11 | 41948320944 |
| 12 | 364990300418 |
| 13 | 3188510652624 |
| 14 | 27953062038914 |
| 15 | 245823065693424 |
| 16 | 2167728096132098 |
| 17 | 19161612027339024 |
| 18 | 169737447404391554 |