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 | 6 |
| 1 | 13 |
| 2 | 28 |
| 3 | 60 |
| 4 | 128 |
| 5 | 272 |
| 6 | 576 |
| 7 | 1216 |
| 8 | 2560 |
| 9 | 5376 |
| 10 | 11264 |
| 11 | 23552 |
| 12 | 49152 |
| 13 | 102400 |
| 14 | 212992 |
| 15 | 442368 |
| 16 | 917504 |
| 17 | 1900544 |
| 18 | 3932160 |
| 19 | 8126464 |
| 20 | 16777216 |
| 21 | 34603008 |
| 22 | 71303168 |
| 23 | 146800640 |
| 24 | 301989888 |
| 25 | 620756992 |
| 26 | 1275068416 |
| 27 | 2617245696 |
| 28 | 5368709120 |