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 | 1 |
| 1 | 3 |
| 2 | 9 |
| 3 | 28 |
| 4 | 83 |
| 5 | 244 |
| 6 | 713 |
| 7 | 2075 |
| 8 | 6029 |
| 9 | 17512 |
| 10 | 50891 |
| 11 | 148037 |
| 12 | 431151 |
| 13 | 1257365 |
| 14 | 3671731 |
| 15 | 10735948 |
| 16 | 31429745 |
| 17 | 92116592 |
| 18 | 270268647 |
| 19 | 793741973 |
| 20 | 2333221387 |
| 21 | 6864280611 |
| 22 | 20210115899 |
| 23 | 59545932370 |
| 24 | 175558633893 |
| 25 | 517915132777 |