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 | 4 |
| 5 | 9 |
| 6 | 14 |
| 7 | 56 |
| 8 | 230 |
| 9 | 965 |
| 10 | 4120 |
| 11 | 17846 |
| 12 | 78244 |
| 13 | 346605 |
| 14 | 1549030 |
| 15 | 6976140 |
| 16 | 31628838 |
| 17 | 144250962 |
| 18 | 661352970 |
| 19 | 3046379300 |
| 20 | 14091723450 |
| 21 | 65432979080 |
| 22 | 304880016970 |
| 23 | 1425043805000 |
| 24 | 6680031216850 |
| 25 | 31396257423925 |
| 26 | 147923222356036 |