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 | 17 |
| 1 | 34 |
| 2 | 68 |
| 3 | 136 |
| 4 | 272 |
| 5 | 544 |
| 6 | 1088 |
| 7 | 2176 |
| 8 | 4352 |
| 9 | 8704 |
| 10 | 17408 |
| 11 | 34816 |
| 12 | 69632 |
| 13 | 139264 |
| 14 | 278528 |
| 15 | 557056 |
| 16 | 1114112 |
| 17 | 2228224 |
| 18 | 4456448 |
| 19 | 8912896 |
| 20 | 17825792 |
| 21 | 35651584 |
| 22 | 71303168 |
| 23 | 142606336 |
| 24 | 285212672 |
| 25 | 570425344 |
| 26 | 1140850688 |
| 27 | 2281701376 |
| 28 | 4563402752 |
| 29 | 9126805504 |
| 30 | 18253611008 |