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 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 10 |
| 5 | 238 |
| 6 | 11368 |
| 7 | 1014888 |
| 8 | 166537616 |
| 9 | 50680432112 |
| 10 | 29107809374336 |
| 11 | 32093527159296128 |
| 12 | 68846607723033232640 |
| 13 | 290126947098532533378816 |
| 14 | 2417684612523425600721132544 |
| 15 | 40013522702538780900803893881856 |