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 | 4 |
| 3 | 72 |
| 4 | 496 |
| 5 | 2100 |
| 6 | 6708 |
| 7 | 17640 |
| 8 | 40384 |
| 9 | 83376 |
| 10 | 158900 |
| 11 | 284108 |
| 12 | 482160 |
| 13 | 783484 |
| 14 | 1227156 |
| 15 | 1862400 |
| 16 | 2750208 |
| 17 | 3965080 |
| 18 | 5596884 |
| 19 | 7752836 |
| 20 | 10559600 |
| 21 | 14165508 |
| 22 | 18742900 |
| 23 | 24490584 |
| 24 | 31636416 |
| 25 | 40440000 |
| 26 | 51195508 |
| 27 | 64234620 |
| 28 | 79929584 |