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 | 2 |
| 2 | 3 |
| 3 | 8 |
| 4 | 45 |
| 5 | 96 |
| 6 | 35 |
| 7 | 17280 |
| 8 | 14175 |
| 9 | 89600 |
| 10 | 149688 |
| 11 | 29030400 |
| 12 | 79625 |
| 13 | 402361344000 |
| 14 | 312741000 |
| 15 | 229605376 |
| 16 | 488462349375 |
| 17 | 83691159552000 |
| 18 | 50697046400 |
| 19 | 8604790260498432 |
| 20 | 1470076286679 |
| 21 | 29967718809600000 |
| 22 | 4694524604733600000 |
| 23 | 269760174666625843200000 |
| 24 | 5699209469078125 |