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) |
|---|---|
| 2 | 1 |
| 3 | 20 |
| 4 | 1071 |
| 5 | 107104 |
| 6 | 17201225 |
| 7 | 4053135456 |
| 8 | 1318104508735 |
| 9 | 565989104282624 |
| 10 | 310299479406324369 |
| 11 | 211554189796535488000 |
| 12 | 175592153482084893991151 |
| 13 | 174356954302176729972264960 |
| 14 | 204111110614488911169799727641 |
| 15 | 278218647289052493421682954399744 |