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 | 6 |
| 3 | 55 |
| 4 | 556 |
| 5 | 7839 |
| 6 | 118141 |
| 7 | 2488800 |
| 8 | 54871741 |
| 9 | 1374282325 |
| 10 | 35786212191 |
| 11 | 1182319284628 |
| 12 | 40234641889543 |
| 13 | 1409394785418633 |
| 14 | 53597236487797597 |
| 15 | 2091701617809524916 |
| 16 | 96271871655725943733 |
| 17 | 4719413412748380767833 |