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 | 9 |
| 1 | 10 |
| 2 | 12 |
| 3 | 16 |
| 4 | 24 |
| 5 | 40 |
| 6 | 72 |
| 7 | 136 |
| 8 | 264 |
| 9 | 520 |
| 10 | 1032 |
| 11 | 2056 |
| 12 | 4104 |
| 13 | 8200 |
| 14 | 16392 |
| 15 | 32776 |
| 16 | 65544 |
| 17 | 131080 |
| 18 | 262152 |
| 19 | 524296 |
| 20 | 1048584 |
| 21 | 2097160 |
| 22 | 4194312 |
| 23 | 8388616 |
| 24 | 16777224 |
| 25 | 33554440 |
| 26 | 67108872 |
| 27 | 134217736 |
| 28 | 268435464 |
| 29 | 536870920 |
| 30 | 1073741832 |