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 | 12 |
| 3 | 24 |
| 4 | 36 |
| 5 | 72 |
| 6 | 120 |
| 7 | 144 |
| 8 | 216 |
| 9 | 360 |
| 10 | 432 |
| 11 | 720 |
| 12 | 1440 |
| 13 | 2160 |
| 14 | 2880 |
| 15 | 4320 |
| 16 | 8640 |
| 17 | 12960 |
| 18 | 17280 |
| 19 | 20160 |
| 20 | 25920 |
| 21 | 30240 |
| 22 | 40320 |
| 23 | 51840 |
| 24 | 60480 |
| 25 | 80640 |
| 26 | 120960 |
| 27 | 181440 |
| 28 | 241920 |
| 29 | 362880 |
| 30 | 483840 |
| 31 | 604800 |
| 32 | 725760 |
| 33 | 967680 |
| 34 | 1209600 |
| 35 | 1451520 |
| 36 | 1814400 |
| 37 | 2177280 |
| 38 | 2419200 |
| 39 | 2903040 |
| 40 | 3628800 |