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 | 6 |
| 1 | 18 |
| 2 | 54 |
| 3 | 108 |
| 4 | 486 |
| 5 | 972 |
| 6 | 1944 |
| 7 | 4374 |
| 8 | 8748 |
| 9 | 17496 |
| 10 | 69984 |
| 11 | 13122 |
| 12 | 162 |
| 13 | 52488 |
| 14 | 209952 |
| 15 | 839808 |
| 16 | 354294 |
| 17 | 708588 |
| 18 | 1417176 |
| 19 | 5668704 |
| 20 | 22674816 |
| 21 | 45349632 |
| 22 | 3188646 |
| 23 | 6377292 |
| 24 | 12754584 |
| 25 | 51018336 |
| 26 | 204073344 |
| 27 | 408146688 |
| 28 | 3265173504 |
| 29 | 258280326 |
| 30 | 516560652 |
| 31 | 1033121304 |