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 | 216 |
| 3 | 3300 |
| 4 | 50050 |
| 5 | 756756 |
| 6 | 11435424 |
| 7 | 172931616 |
| 8 | 2618916300 |
| 9 | 39731777800 |
| 10 | 603923022560 |
| 11 | 9197348345640 |
| 12 | 140334704005860 |
| 13 | 2145155731845000 |
| 14 | 32847841152720000 |
| 15 | 503812888080163200 |
| 16 | 7739375660195721300 |
| 17 | 119063197872768778200 |
| 18 | 1834199559285273180000 |