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 | 7 |
| 2 | 9 |
| 3 | 13 |
| 4 | 21 |
| 5 | 37 |
| 6 | 69 |
| 7 | 133 |
| 8 | 261 |
| 9 | 517 |
| 10 | 1029 |
| 11 | 2053 |
| 12 | 4101 |
| 13 | 8197 |
| 14 | 16389 |
| 15 | 32773 |
| 16 | 65541 |
| 17 | 131077 |
| 18 | 262149 |
| 19 | 524293 |
| 20 | 1048581 |
| 21 | 2097157 |
| 22 | 4194309 |
| 23 | 8388613 |
| 24 | 16777221 |
| 25 | 33554437 |
| 26 | 67108869 |
| 27 | 134217733 |
| 28 | 268435461 |
| 29 | 536870917 |
| 30 | 1073741829 |
| 31 | 2147483653 |