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) |
|---|---|
| 3 | 3 |
| 4 | 4 |
| 5 | 9 |
| 6 | 10 |
| 7 | 21 |
| 8 | 22 |
| 9 | 45 |
| 10 | 46 |
| 11 | 93 |
| 12 | 94 |
| 13 | 189 |
| 14 | 190 |
| 15 | 381 |
| 16 | 382 |
| 17 | 765 |
| 18 | 766 |
| 19 | 1533 |
| 20 | 1534 |
| 21 | 3069 |
| 22 | 3070 |
| 23 | 6141 |
| 24 | 6142 |
| 25 | 12285 |
| 26 | 12286 |
| 27 | 24573 |
| 28 | 24574 |
| 29 | 49149 |
| 30 | 49150 |