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 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 4 |
| 6 | 11 |
| 7 | 31 |
| 8 | 86 |
| 9 | 230 |
| 10 | 608 |
| 11 | 1588 |
| 12 | 4151 |
| 13 | 10925 |
| 14 | 29083 |
| 15 | 78373 |
| 16 | 213702 |
| 17 | 588366 |
| 18 | 1631906 |
| 19 | 4550346 |
| 20 | 12736029 |
| 21 | 35746763 |
| 22 | 100561622 |
| 23 | 283486702 |
| 24 | 800798659 |
| 25 | 2266802139 |
| 26 | 6429960961 |
| 27 | 18276530005 |
| 28 | 52051825058 |
| 29 | 148520257620 |
| 30 | 424507695627 |