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 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 6 |
| 5 | 6 |
| 6 | 24 |
| 7 | 72 |
| 8 | 144 |
| 9 | 147 |
| 10 | 588 |
| 11 | 672 |
| 12 | 2136 |
| 13 | 10152 |
| 14 | 11520 |
| 15 | 29484 |
| 16 | 117936 |
| 17 | 270576 |
| 18 | 656352 |
| 19 | 2062368 |
| 20 | 4040160 |