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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 14 |
| 6 | 39 |
| 7 | 114 |
| 8 | 339 |
| 9 | 1028 |
| 10 | 3163 |
| 11 | 9852 |
| 12 | 31005 |
| 13 | 98436 |
| 14 | 314901 |
| 15 | 1014070 |
| 16 | 3284657 |
| 17 | 10694314 |
| 18 | 34979667 |
| 19 | 114887846 |
| 20 | 378750951 |
| 21 | 1252865288 |
| 22 | 4157150327 |
| 23 | 13832926200 |
| 24 | 46148704121 |
| 25 | 154327715592 |
| 26 | 517236429545 |
| 27 | 1737102081962 |
| 28 | 5845077156189 |
| 29 | 19702791805126 |