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 | 2 |
| 5 | 4 |
| 6 | 8 |
| 7 | 17 |
| 8 | 52 |
| 9 | 153 |
| 10 | 482 |
| 11 | 1623 |
| 12 | 5879 |
| 13 | 21926 |
| 14 | 85436 |
| 15 | 344998 |
| 16 | 1444437 |
| 17 | 6230232 |
| 18 | 27704051 |
| 19 | 126571091 |
| 20 | 593974930 |
| 21 | 2856031804 |
| 22 | 14065575098 |
| 23 | 70822693101 |
| 24 | 364420818168 |
| 25 | 1913609207886 |
| 26 | 10249715874962 |
| 27 | 55938458263035 |
| 28 | 310915671908063 |
| 29 | 1758452185453926 |
| 30 | 10115287840489764 |