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 | 60 |
| 3 | 1848 |
| 4 | 15960 |
| 5 | 80040 |
| 6 | 292740 |
| 7 | 868560 |
| 8 | 2218608 |
| 9 | 5062320 |
| 10 | 10575180 |
| 11 | 20577480 |
| 12 | 37769160 |
| 13 | 66015768 |
| 14 | 110690580 |
| 15 | 179077920 |
| 16 | 280842720 |
| 17 | 428571360 |
| 18 | 638388828 |
| 19 | 930657240 |
| 20 | 1330760760 |
| 21 | 1869981960 |
| 22 | 2586474660 |
| 23 | 3526338288 |
| 24 | 4744798800 |