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 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 12 |
| 6 | 5 |
| 7 | 20 |
| 8 | 105 |
| 9 | 280 |
| 10 | 63 |
| 11 | 2520 |
| 12 | 385 |
| 13 | 5544 |
| 14 | 6435 |
| 15 | 8008 |
| 16 | 45045 |
| 17 | 144144 |
| 18 | 85085 |
| 19 | 116688 |
| 20 | 2909907 |
| 21 | 739024 |
| 22 | 146965 |
| 23 | 232792560 |
| 24 | 37182145 |
| 25 | 356948592 |
| 26 | 128707425 |
| 27 | 2974571600 |
| 28 | 717084225 |
| 29 | 80313433200 |
| 30 | 215656441 |
| 31 | 30247916400 |
| 32 | 4512611027925 |
| 33 | 486207248800 |