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 | 3 |
| 2 | 0 |
| 3 | 6 |
| 4 | 6 |
| 5 | 24 |
| 6 | 18 |
| 7 | 78 |
| 8 | 72 |
| 9 | 234 |
| 10 | 216 |
| 11 | 726 |
| 12 | 696 |
| 13 | 2184 |
| 14 | 2106 |
| 15 | 6528 |
| 16 | 6480 |
| 17 | 19680 |
| 18 | 19422 |
| 19 | 59046 |
| 20 | 58800 |
| 21 | 177060 |
| 22 | 176418 |
| 23 | 531438 |
| 24 | 530640 |
| 25 | 1594296 |
| 26 | 1592136 |
| 27 | 4782726 |
| 28 | 4780776 |
| 29 | 14348904 |
| 30 | 14342112 |
| 31 | 43046718 |
| 32 | 43040160 |
| 33 | 129139428 |
| 34 | 129120480 |
| 35 | 387420384 |
| 36 | 387400104 |
| 37 | 1162261464 |
| 38 | 1162202418 |
| 39 | 3486782208 |