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) |
|---|---|
| 3 | 198 |
| 4 | 4900 |
| 5 | 240312 |
| 6 | 23395376 |
| 7 | 4531118784 |
| 8 | 1749027373184 |
| 9 | 1347335578414080 |
| 10 | 2073100143249356800 |
| 11 | 6374782039282565480448 |
| 12 | 39187907355886437009522688 |
| 13 | 481684681120059363288611291136 |
| 14 | 11839809344351753924631214042382336 |
| 15 | 582001612807237989283840810619309654016 |