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) |
|---|---|
| 6 | 5 |
| 7 | 55 |
| 8 | 420 |
| 9 | 2600 |
| 10 | 14175 |
| 11 | 70665 |
| 12 | 329800 |
| 13 | 1462680 |
| 14 | 6228945 |
| 15 | 25661875 |
| 16 | 102847560 |
| 17 | 402706500 |
| 18 | 1545715325 |
| 19 | 5831511195 |
| 20 | 21671504880 |
| 21 | 79475234200 |
| 22 | 288043346370 |
| 23 | 1033030388790 |
| 24 | 3669961024940 |
| 25 | 12927078062500 |
| 26 | 45182780785500 |
| 27 | 156811313843420 |
| 28 | 540722493900480 |
| 29 | 1853503409060160 |