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 | 15 |
| 2 | 225 |
| 3 | 360 |
| 4 | 1872 |
| 5 | 7744 |
| 6 | 29760 |
| 7 | 126688 |
| 8 | 520608 |
| 9 | 2103000 |
| 10 | 8741840 |
| 11 | 35823024 |
| 12 | 146214208 |
| 13 | 604202544 |
| 14 | 2474564288 |
| 15 | 10137402552 |
| 16 | 41768664000 |
| 17 | 171129168720 |
| 18 | 702148157568 |
| 19 | 2888077723232 |
| 20 | 11839454522224 |
| 21 | 48607631557944 |