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 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 8 |
| 5 | 17 |
| 6 | 32 |
| 7 | 64 |
| 8 | 129 |
| 9 | 256 |
| 10 | 513 |
| 11 | 1024 |
| 12 | 2051 |
| 13 | 4093 |
| 14 | 8192 |
| 15 | 16381 |
| 16 | 32746 |
| 17 | 65523 |
| 18 | 131082 |
| 19 | 262168 |
| 20 | 524262 |
| 21 | 1048547 |
| 22 | 2097100 |
| 23 | 4194345 |
| 24 | 8388733 |
| 25 | 16777351 |
| 26 | 33554669 |
| 27 | 67109796 |
| 28 | 134219275 |
| 29 | 268437750 |
| 30 | 536872179 |