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 | 2 |
| 3 | 6 |
| 4 | 24 |
| 5 | 120 |
| 6 | 20 |
| 7 | 140 |
| 8 | 630 |
| 9 | 70 |
| 10 | 7 |
| 11 | 77 |
| 12 | 924 |
| 13 | 12012 |
| 14 | 858 |
| 15 | 5720 |
| 16 | 12870 |
| 17 | 218790 |
| 18 | 12155 |
| 19 | 230945 |
| 20 | 46189 |
| 21 | 969969 |
| 22 | 176358 |
| 23 | 4056234 |
| 24 | 676039 |
| 25 | 676039 |
| 26 | 104006 |
| 27 | 312018 |
| 28 | 44574 |
| 29 | 1292646 |
| 30 | 1077205 |
| 31 | 33393355 |
| 32 | 66786710 |
| 33 | 2203961430 |
| 34 | 64822395 |
| 35 | 90751353 |
| 36 | 90751353 |
| 37 | 3357800061 |