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) |
|---|---|
| 0 | 6 |
| 1 | 15 |
| 2 | 105 |
| 3 | 105 |
| 4 | 165 |
| 5 | 15015 |
| 6 | 1365 |
| 7 | 255 |
| 8 | 33915 |
| 9 | 21945 |
| 10 | 3795 |
| 11 | 31395 |
| 12 | 1365 |
| 13 | 435 |
| 14 | 1038345 |
| 15 | 608685 |
| 16 | 255 |
| 17 | 959595 |
| 18 | 959595 |
| 19 | 6765 |
| 20 | 2036265 |
| 21 | 103845 |
| 22 | 16215 |
| 23 | 1090635 |
| 24 | 255255 |
| 25 | 8745 |
| 26 | 105735 |
| 27 | 57855 |
| 28 | 25665 |
| 29 | 1675208535 |