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 | 55 |
| 3 | 3850 |
| 4 | 298375 |
| 5 | 24466750 |
| 6 | 2079673750 |
| 7 | 181228712500 |
| 8 | 16084048234375 |
| 9 | 1447564341093750 |
| 10 | 131728355039531250 |
| 11 | 12095058053629687500 |
| 12 | 1118792869960746093750 |
| 13 | 104133797896346367187500 |
| 14 | 9743948231729552929687500 |
| 15 | 915931133782577975390625000 |
| 16 | 86441000750730796427490234375 |