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 | 1 |
| 2 | 0 |
| 3 | 1 |
| 4 | 1 |
| 5 | 3 |
| 6 | 3 |
| 7 | 6 |
| 8 | 28 |
| 9 | 42 |
| 10 | 21 |
| 11 | 91 |
| 12 | 510 |
| 13 | 1050 |
| 14 | 945 |
| 15 | 315 |
| 16 | 2820 |
| 17 | 18631 |
| 18 | 48360 |
| 19 | 61845 |
| 20 | 39060 |
| 21 | 9765 |
| 22 | 177661 |
| 23 | 1351413 |
| 24 | 4220433 |
| 25 | 6942915 |
| 26 | 6357015 |
| 27 | 3075975 |
| 28 | 615195 |