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) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 4 |
| 7 | 6 |
| 8 | 14 |
| 9 | 29 |
| 10 | 63 |
| 11 | 129 |
| 12 | 300 |
| 13 | 756 |
| 14 | 1677 |
| 15 | 4134 |
| 16 | 9525 |
| 17 | 22841 |
| 18 | 57175 |
| 19 | 141819 |
| 20 | 354992 |
| 21 | 882420 |
| 22 | 2218078 |
| 23 | 5588989 |
| 24 | 14173217 |
| 25 | 35918542 |