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 | 2 |
| 2 | 3 |
| 3 | 12 |
| 4 | 30 |
| 5 | 30 |
| 6 | 105 |
| 7 | 840 |
| 8 | 252 |
| 9 | 1260 |
| 10 | 6930 |
| 11 | 1980 |
| 12 | 12870 |
| 13 | 2574 |
| 14 | 2145 |
| 15 | 34320 |
| 16 | 291720 |
| 17 | 79560 |
| 18 | 151164 |
| 19 | 1511640 |
| 20 | 406980 |
| 21 | 4476780 |
| 22 | 51482970 |
| 23 | 13728792 |
| 24 | 171609900 |
| 25 | 318704100 |
| 26 | 84362850 |
| 27 | 1181079900 |
| 28 | 311375610 |
| 29 | 81940950 |
| 30 | 1270084725 |
| 31 | 40642711200 |
| 32 | 10644519600 |