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 | 672 |
| 2 | 2016 |
| 3 | 69300 |
| 4 | 146160 |
| 5 | 207900 |
| 6 | 1627920 |
| 7 | 8316000 |
| 8 | 9828000 |
| 9 | 38253600 |
| 10 | 60147360 |
| 11 | 105814800 |
| 12 | 158004000 |
| 13 | 726818400 |
| 14 | 95935039200 |
| 15 | 191870078400 |
| 16 | 2206505901600 |
| 17 | 3463953292800 |
| 18 | 3800093497200 |
| 19 | 4413011803200 |
| 20 | 7600186994400 |
| 21 | 8826023606400 |