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 | 12 |
| 2 | 96 |
| 3 | 640 |
| 4 | 3840 |
| 5 | 21504 |
| 6 | 114688 |
| 7 | 589824 |
| 8 | 2949120 |
| 9 | 14417920 |
| 10 | 69206016 |
| 11 | 327155712 |
| 12 | 1526726656 |
| 13 | 7046430720 |
| 14 | 32212254720 |
| 15 | 146028888064 |
| 16 | 657129996288 |
| 17 | 2937757630464 |
| 18 | 13056700579840 |
| 19 | 57724360458240 |
| 20 | 253987186016256 |
| 21 | 1112705767309312 |
| 22 | 4855443348258816 |