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 | 1 |
| 2 | 4 |
| 3 | 8 |
| 4 | 24 |
| 5 | 120 |
| 6 | 1170 |
| 7 | 1512 |
| 8 | 15748 |
| 9 | 15748 |
| 10 | 61440 |
| 11 | 196584 |
| 12 | 1572840 |
| 13 | 1098240 |
| 14 | 15605760 |
| 15 | 50328576 |
| 16 | 7074432 |
| 17 | 355532800 |
| 18 | 2143289344 |
| 19 | 13815410400 |
| 20 | 224319234048 |
| 21 | 33541980160 |
| 22 | 109760857440 |
| 23 | 1468475386560 |
| 24 | 33151875434496 |
| 25 | 1415960985600 |
| 26 | 1510712608204800 |