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 | 2 |
| 2 | 3 |
| 3 | 6 |
| 4 | 13 |
| 5 | 30 |
| 6 | 65 |
| 7 | 127 |
| 8 | 258 |
| 9 | 530 |
| 10 | 1009 |
| 11 | 1988 |
| 12 | 3942 |
| 13 | 8004 |
| 14 | 16195 |
| 15 | 32389 |
| 16 | 64923 |
| 17 | 129870 |
| 18 | 260326 |
| 19 | 520787 |
| 20 | 1043257 |
| 21 | 2085202 |
| 22 | 4171403 |
| 23 | 8338443 |