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 | 3 |
| 2 | 11 |
| 3 | 61 |
| 4 | 213 |
| 5 | 4107 |
| 6 | 14339 |
| 7 | 79189 |
| 8 | 276477 |
| 9 | 5330883 |
| 10 | 18612011 |
| 11 | 102787261 |
| 12 | 358866933 |
| 13 | 6919482027 |
| 14 | 24158375939 |
| 15 | 133417785589 |
| 16 | 465809002557 |
| 17 | 8981482340163 |
| 18 | 31357553356811 |
| 19 | 173176182907261 |
| 20 | 604619726452053 |
| 21 | 11657957158049547 |
| 22 | 40702080098764739 |