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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 1 |
| 8 | 2 |
| 9 | 4 |
| 10 | 8 |
| 11 | 16 |
| 12 | 32 |
| 13 | 65 |
| 14 | 130 |
| 15 | 260 |
| 16 | 520 |
| 17 | 1040 |
| 18 | 2080 |
| 19 | 4161 |
| 20 | 8322 |
| 21 | 16644 |
| 22 | 33288 |
| 23 | 66577 |
| 24 | 133154 |
| 25 | 266309 |
| 26 | 532618 |
| 27 | 1065236 |
| 28 | 2130472 |
| 29 | 4260944 |