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) |
|---|---|
| 2 | 12 |
| 3 | 336 |
| 4 | 9688 |
| 5 | 184000 |
| 6 | 1969212 |
| 7 | 14039088 |
| 8 | 75099360 |
| 9 | 324796176 |
| 10 | 1192537500 |
| 11 | 3844187424 |
| 12 | 11144826264 |
| 13 | 29583574384 |
| 14 | 72891000364 |
| 15 | 168494340000 |
| 16 | 368541092736 |
| 17 | 768025638240 |
| 18 | 1533632745708 |
| 19 | 2948331631152 |
| 20 | 5478589599000 |
| 21 | 9873410641248 |
| 22 | 17307337994716 |
| 23 | 29583198551632 |