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 | 4 |
| 1 | 14 |
| 2 | 44 |
| 3 | 134 |
| 4 | 404 |
| 5 | 1214 |
| 6 | 3644 |
| 7 | 10934 |
| 8 | 32804 |
| 9 | 98414 |
| 10 | 295244 |
| 11 | 885734 |
| 12 | 2657204 |
| 13 | 7971614 |
| 14 | 23914844 |
| 15 | 71744534 |
| 16 | 215233604 |
| 17 | 645700814 |
| 18 | 1937102444 |
| 19 | 5811307334 |
| 20 | 17433922004 |
| 21 | 52301766014 |
| 22 | 156905298044 |
| 23 | 470715894134 |
| 24 | 1412147682404 |
| 25 | 4236443047214 |