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 | 7 |
| 3 | 15 |
| 4 | 32 |
| 5 | 69 |
| 6 | 149 |
| 7 | 321 |
| 8 | 691 |
| 9 | 1488 |
| 10 | 3205 |
| 11 | 6903 |
| 12 | 14867 |
| 13 | 32019 |
| 14 | 68960 |
| 15 | 148521 |
| 16 | 319873 |
| 17 | 688917 |
| 18 | 1483735 |
| 19 | 3195552 |
| 20 | 6882329 |
| 21 | 14822619 |
| 22 | 31923791 |
| 23 | 68754951 |
| 24 | 148079008 |
| 25 | 318920925 |
| 26 | 686866813 |
| 27 | 1479319737 |
| 28 | 3186042539 |
| 29 | 6861847920 |