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 | 2 |
| 3 | 6 |
| 4 | 8 |
| 5 | 120 |
| 6 | 12 |
| 7 | 5040 |
| 8 | 128 |
| 9 | 1296 |
| 10 | 240 |
| 11 | 39916800 |
| 12 | 48 |
| 13 | 6227020800 |
| 14 | 10080 |
| 15 | 720 |
| 16 | 8192 |
| 17 | 355687428096000 |
| 18 | 2592 |
| 19 | 121645100408832000 |
| 20 | 960 |
| 21 | 30240 |
| 22 | 79833600 |
| 23 | 25852016738884976640000 |
| 24 | 768 |
| 25 | 384000000 |
| 26 | 12454041600 |
| 27 | 25509168 |
| 28 | 40320 |
| 29 | 8841761993739701954543616000000 |
| 30 | 1440 |