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 | 3 |
| 3 | 6 |
| 4 | 36 |
| 5 | 105 |
| 6 | 120 |
| 7 | 210 |
| 8 | 630 |
| 9 | 5460 |
| 10 | 25200 |
| 11 | 73920 |
| 12 | 97020 |
| 13 | 157080 |
| 14 | 1185030 |
| 15 | 2031120 |
| 16 | 2162160 |
| 17 | 17907120 |
| 18 | 76576500 |
| 19 | 236215980 |
| 20 | 7534947420 |
| 21 | 12249176940 |
| 22 | 78091322400 |
| 23 | 203522319000 |
| 24 | 666365279580 |
| 25 | 2427046221600 |
| 26 | 3638780505360 |
| 27 | 12112252031880 |
| 28 | 70233049766880 |
| 29 | 108825865948800 |