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 | 8 |
| 2 | 24 |
| 3 | 80 |
| 4 | 280 |
| 5 | 1008 |
| 6 | 3696 |
| 7 | 13728 |
| 8 | 51480 |
| 9 | 194480 |
| 10 | 739024 |
| 11 | 2821728 |
| 12 | 10816624 |
| 13 | 41602400 |
| 14 | 160466400 |
| 15 | 620470080 |
| 16 | 2404321560 |
| 17 | 9334424880 |
| 18 | 36300541200 |
| 19 | 141381055200 |
| 20 | 551386115280 |
| 21 | 2153031497760 |
| 22 | 8416395854880 |
| 23 | 32933722910400 |
| 24 | 128990414732400 |
| 25 | 505642425751008 |
| 26 | 1983674131792416 |