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 | 2 |
| 2 | 3 |
| 3 | 6 |
| 4 | 13 |
| 5 | 28 |
| 6 | 66 |
| 7 | 148 |
| 8 | 349 |
| 9 | 828 |
| 10 | 2005 |
| 11 | 4880 |
| 12 | 12043 |
| 13 | 29852 |
| 14 | 74645 |
| 15 | 187498 |
| 16 | 473448 |
| 17 | 1199630 |
| 18 | 3050554 |
| 19 | 7778234 |
| 20 | 19885465 |
| 21 | 50950796 |
| 22 | 130824763 |
| 23 | 336555890 |
| 24 | 867389312 |
| 25 | 2239220294 |
| 26 | 5789804688 |