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 | 11 |
| 4 | 105 |
| 5 | 510 |
| 6 | 1750 |
| 7 | 4830 |
| 8 | 11466 |
| 9 | 24360 |
| 10 | 47520 |
| 11 | 86625 |
| 12 | 149435 |
| 13 | 246246 |
| 14 | 390390 |
| 15 | 598780 |
| 16 | 892500 |
| 17 | 1297440 |
| 18 | 1844976 |
| 19 | 2572695 |
| 20 | 3525165 |
| 21 | 4754750 |
| 22 | 6322470 |
| 23 | 8298906 |
| 24 | 10765150 |
| 25 | 13813800 |
| 26 | 17550000 |
| 27 | 22092525 |
| 28 | 27574911 |
| 29 | 34146630 |
| 30 | 41974310 |