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 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 1 |
| 6 | 10 |
| 7 | 99 |
| 8 | 1024 |
| 9 | 11304 |
| 10 | 133669 |
| 11 | 1695429 |
| 12 | 23023811 |
| 13 | 333840443 |
| 14 | 5153118154 |
| 15 | 84426592621 |
| 16 | 1463941342191 |
| 17 | 26793750988542 |
| 18 | 516319125748337 |
| 19 | 10451197169218523 |
| 20 | 221738082618710329 |
| 21 | 4921234092461339819 |
| 22 | 114041894068935641488 |