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 | 1 |
| 2 | 4 |
| 3 | 18 |
| 4 | 24 |
| 5 | 27 |
| 6 | 160 |
| 7 | 1470 |
| 8 | 1500 |
| 9 | 1701 |
| 10 | 1920 |
| 11 | 2205 |
| 12 | 25515 |
| 13 | 27951 |
| 14 | 392392 |
| 15 | 424710 |
| 16 | 429000 |
| 17 | 481250 |
| 18 | 500500 |
| 19 | 8824530 |
| 20 | 8825856 |
| 21 | 185435250 |
| 22 | 194922000 |
| 23 | 204289085 |
| 24 | 214451328 |