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 | 14 |
| 2 | 273 |
| 3 | 7645 |
| 4 | 296296 |
| 5 | 15291640 |
| 6 | 1017067024 |
| 7 | 84865562640 |
| 8 | 8689315795776 |
| 9 | 1071814846360896 |
| 10 | 156823829909121024 |
| 11 | 26862299458337581056 |
| 12 | 5325923338791614078976 |
| 13 | 1210310405427816646041600 |
| 14 | 312542036038910895995289600 |
| 15 | 91018216923341770801874534400 |