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 | 24 |
| 3 | 192 |
| 4 | 960 |
| 5 | 3840 |
| 6 | 13440 |
| 7 | 43008 |
| 8 | 129024 |
| 9 | 368640 |
| 10 | 1013760 |
| 11 | 2703360 |
| 12 | 7028736 |
| 13 | 17891328 |
| 14 | 44728320 |
| 15 | 110100480 |
| 16 | 267386880 |
| 17 | 641728512 |
| 18 | 1524105216 |
| 19 | 3586129920 |
| 20 | 8367636480 |
| 21 | 19377684480 |
| 22 | 44568674304 |
| 23 | 101871255552 |
| 24 | 231525580800 |
| 25 | 523449139200 |
| 26 | 1177760563200 |
| 27 | 2638183661568 |