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 | 414912 |
| 4 | 6654048 |
| 5 | 30938640 |
| 6 | 85654320 |
| 7 | 181790352 |
| 8 | 330218544 |
| 9 | 541990896 |
| 10 | 828222216 |
| 11 | 1200035436 |
| 12 | 1668553872 |
| 13 | 2244900840 |
| 14 | 2940199656 |
| 15 | 3765573636 |
| 16 | 4732146096 |
| 17 | 5851040352 |
| 18 | 7133379720 |
| 19 | 8590287516 |
| 20 | 10232887056 |
| 21 | 12072301656 |