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 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 4 |
| 5 | 12 |
| 6 | 27 |
| 7 | 78 |
| 8 | 208 |
| 9 | 635 |
| 10 | 1859 |
| 11 | 5726 |
| 12 | 17526 |
| 13 | 54620 |
| 14 | 170479 |
| 15 | 536714 |
| 16 | 1694567 |
| 17 | 5376764 |
| 18 | 17110286 |
| 19 | 54631302 |
| 20 | 174879997 |
| 21 | 561229678 |
| 22 | 1805022806 |
| 23 | 5817191196 |
| 24 | 18781911278 |
| 25 | 60744460580 |