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 | 6 |
| 2 | 36 |
| 3 | 78 |
| 4 | 189 |
| 5 | 490 |
| 6 | 1113 |
| 7 | 2449 |
| 8 | 5474 |
| 9 | 12036 |
| 10 | 26100 |
| 11 | 56595 |
| 12 | 122472 |
| 13 | 264061 |
| 14 | 568695 |
| 15 | 1224190 |
| 16 | 2633000 |
| 17 | 5660226 |
| 18 | 12165489 |
| 19 | 26141850 |
| 20 | 56165805 |
| 21 | 120662377 |
| 22 | 259206930 |
| 23 | 556801480 |
| 24 | 1196027864 |
| 25 | 2569059663 |
| 26 | 5518244160 |
| 27 | 11852866905 |
| 28 | 25459111647 |