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) |
|---|---|
| 3 | 1 |
| 4 | 1 |
| 5 | 2 |
| 6 | 6 |
| 7 | 14 |
| 8 | 41 |
| 9 | 157 |
| 10 | 725 |
| 11 | 4196 |
| 12 | 29816 |
| 13 | 246644 |
| 14 | 2297075 |
| 15 | 23503477 |
| 16 | 260265023 |
| 17 | 3090336300 |
| 18 | 39101547971 |
| 19 | 524782945991 |
| 20 | 7443247863498 |
| 21 | 111221983956652 |
| 22 | 1746165682538497 |
| 23 | 28734206614035245 |
| 24 | 494526496354065244 |
| 25 | 8883865784392246280 |
| 26 | 166286434745252091055 |
| 27 | 3237719048384605059117 |
| 28 | 65477287940472122129194 |