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 | 30 |
| 2 | 756 |
| 3 | 18360 |
| 4 | 441936 |
| 5 | 10614240 |
| 6 | 254788416 |
| 7 | 6115201920 |
| 8 | 146766525696 |
| 9 | 3522406694400 |
| 10 | 84537821131776 |
| 11 | 2028908069959680 |
| 12 | 48693795855814656 |
| 13 | 1168651113600245760 |
| 14 | 28047626804770062336 |
| 15 | 673143043784666480640 |