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 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 12 |
| 5 | 36 |
| 6 | 108 |
| 7 | 432 |
| 8 | 1728 |
| 9 | 6912 |
| 10 | 27648 |
| 11 | 138240 |
| 12 | 691200 |
| 13 | 3456000 |
| 14 | 17280000 |
| 15 | 86400000 |
| 16 | 518400000 |
| 17 | 3110400000 |
| 18 | 18662400000 |
| 19 | 111974400000 |
| 20 | 671846400000 |
| 21 | 4031078400000 |
| 22 | 28217548800000 |
| 23 | 197522841600000 |
| 24 | 1382659891200000 |
| 25 | 9678619238400000 |
| 26 | 67750334668800000 |