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 | 4 |
| 3 | 10 |
| 4 | 19 |
| 5 | 51 |
| 6 | 112 |
| 7 | 316 |
| 8 | 841 |
| 9 | 2378 |
| 10 | 6656 |
| 11 | 18822 |
| 12 | 54110 |
| 13 | 156081 |
| 14 | 456362 |
| 15 | 1339875 |
| 16 | 3954181 |
| 17 | 11726896 |
| 18 | 34900213 |
| 19 | 104248948 |
| 20 | 312357934 |
| 21 | 938457801 |
| 22 | 2826683630 |
| 23 | 8533327397 |
| 24 | 25814570672 |
| 25 | 78239402726 |
| 26 | 237542444180 |
| 27 | 722354138859 |
| 28 | 2199894223892 |