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 | 1 |
| 2 | 8 |
| 3 | 108 |
| 4 | 2144 |
| 5 | 56250 |
| 6 | 1836792 |
| 7 | 71799504 |
| 8 | 3269445888 |
| 9 | 169974711630 |
| 10 | 9934458411800 |
| 11 | 644825382429096 |
| 12 | 46022332032100800 |
| 13 | 3582265183110626740 |
| 14 | 302002255041807372080 |
| 15 | 27413749834141448520000 |
| 16 | 2665789990569658618398720 |
| 17 | 276477318687585566522176470 |