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) |
|---|---|
| 3 | 15 |
| 4 | 210 |
| 5 | 1365 |
| 6 | 5985 |
| 7 | 20475 |
| 8 | 58905 |
| 9 | 148995 |
| 10 | 341055 |
| 11 | 720720 |
| 12 | 1426425 |
| 13 | 2672670 |
| 14 | 4780230 |
| 15 | 8214570 |
| 16 | 13633830 |
| 17 | 21947850 |
| 18 | 34389810 |
| 19 | 52602165 |
| 20 | 78738660 |
| 21 | 115584315 |
| 22 | 166695375 |
| 23 | 236561325 |
| 24 | 330791175 |
| 25 | 456326325 |
| 26 | 621682425 |
| 27 | 837222750 |
| 28 | 1115465715 |
| 29 | 1471429260 |
| 30 | 1923014940 |