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 | 6 |
| 2 | 60 |
| 3 | 210 |
| 4 | 55440 |
| 5 | 1716 |
| 6 | 742560 |
| 7 | 5814 |
| 8 | 4037880 |
| 9 | 7866331200 |
| 10 | 26970 |
| 11 | 51889178880 |
| 12 | 89927760 |
| 13 | 74046 |
| 14 | 184072680 |
| 15 | 776881123200 |
| 16 | 1719393207840 |
| 17 | 215940 |
| 18 | 4383026968320 |
| 19 | 1562389080 |
| 20 | 373176 |
| 21 | 14609718723600 |
| 22 | 3484127520 |
| 23 | 34726953602880 |
| 24 | 518607878946393600 |
| 25 | 9505049400 |
| 26 | 1061106 |