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 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 4 |
| 4 | 15 |
| 5 | 24 |
| 6 | 105 |
| 7 | 192 |
| 8 | 945 |
| 9 | 1920 |
| 10 | 10395 |
| 11 | 23040 |
| 12 | 135135 |
| 13 | 322560 |
| 14 | 2027025 |
| 15 | 5160960 |
| 16 | 34459425 |
| 17 | 92897280 |
| 18 | 654729075 |
| 19 | 1857945600 |
| 20 | 13749310575 |
| 21 | 40874803200 |
| 22 | 316234143225 |
| 23 | 980995276800 |
| 24 | 7905853580625 |
| 25 | 25505877196800 |
| 26 | 213458046676875 |