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 | 3 |
| 2 | 3 |
| 3 | 12 |
| 4 | 12 |
| 5 | 60 |
| 6 | 540 |
| 7 | 1080 |
| 8 | 6480 |
| 9 | 32400 |
| 10 | 97200 |
| 11 | 486000 |
| 12 | 3888000 |
| 13 | 34992000 |
| 14 | 244944000 |
| 15 | 2204496000 |
| 16 | 6613488000 |
| 17 | 13226976000 |
| 18 | 39680928000 |
| 19 | 317447424000 |
| 20 | 1269789696000 |
| 21 | 7618738176000 |
| 22 | 15237476352000 |
| 23 | 91424858112000 |
| 24 | 365699432448000 |
| 25 | 1097098297344000 |