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 | 11234 |
| 10 | 132269 |
| 11 | 1670481 |
| 12 | 22586759 |
| 13 | 326104782 |
| 14 | 5012334813 |
| 15 | 81773199730 |
| 16 | 1411970823695 |
| 17 | 25734352973795 |
| 18 | 493835621908325 |
| 19 | 9954533195180673 |
| 20 | 210325338388169070 |
| 21 | 4648654469101584811 |
| 22 | 107281499755284506084 |