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 | 0 |
| 1 | 8 |
| 2 | 100 |
| 3 | 1088 |
| 4 | 11008 |
| 5 | 106496 |
| 6 | 999424 |
| 7 | 9175040 |
| 8 | 82837504 |
| 9 | 738197504 |
| 10 | 6509559808 |
| 11 | 56908316672 |
| 12 | 493921239040 |
| 13 | 4260607557632 |
| 14 | 36558761623552 |
| 15 | 312261302288384 |
| 16 | 2656420092706816 |
| 17 | 22517998136852480 |
| 18 | 190277084256403456 |
| 19 | 1603281467343896576 |
| 20 | 13474770085092524032 |