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 | 4 |
| 2 | 1 |
| 3 | 24 |
| 4 | 6 |
| 5 | 144 |
| 6 | 36 |
| 7 | 864 |
| 8 | 216 |
| 9 | 5184 |
| 10 | 1296 |
| 11 | 31104 |
| 12 | 7776 |
| 13 | 186624 |
| 14 | 46656 |
| 15 | 1119744 |
| 16 | 279936 |
| 17 | 6718464 |
| 18 | 1679616 |
| 19 | 40310784 |
| 20 | 10077696 |
| 21 | 241864704 |
| 22 | 60466176 |
| 23 | 1451188224 |
| 24 | 362797056 |
| 25 | 8707129344 |
| 26 | 2176782336 |
| 27 | 52242776064 |
| 28 | 13060694016 |
| 29 | 313456656384 |