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 | 3 |
| 1 | 30 |
| 2 | 180 |
| 3 | 840 |
| 4 | 3360 |
| 5 | 12096 |
| 6 | 40320 |
| 7 | 126720 |
| 8 | 380160 |
| 9 | 1098240 |
| 10 | 3075072 |
| 11 | 8386560 |
| 12 | 22364160 |
| 13 | 58490880 |
| 14 | 150405120 |
| 15 | 381026304 |
| 16 | 952565760 |
| 17 | 2353397760 |
| 18 | 5752750080 |
| 19 | 13927710720 |
| 20 | 33426505728 |
| 21 | 79586918400 |
| 22 | 188114534400 |
| 23 | 441660211200 |
| 24 | 1030540492800 |
| 25 | 2390853943296 |