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 | 1 |
| 2 | 672 |
| 3 | 30240 |
| 4 | 23569920 |
| 5 | 45532800 |
| 6 | 164989440 |
| 7 | 447828480 |
| 8 | 623397600 |
| 9 | 1381161600 |
| 10 | 1862023680 |
| 11 | 2144862720 |
| 12 | 3134799360 |
| 13 | 3831421440 |
| 14 | 13584130560 |
| 15 | 14182439040 |
| 16 | 16569653760 |
| 17 | 21943595520 |
| 18 | 22933532160 |
| 19 | 34482792960 |
| 20 | 35032757760 |
| 21 | 40752391680 |
| 22 | 53621568000 |
| 23 | 56481384960 |