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) |
|---|---|
| 1 | 7 |
| 2 | 17 |
| 3 | 34 |
| 4 | 68 |
| 5 | 159 |
| 6 | 257 |
| 7 | 514 |
| 8 | 1028 |
| 9 | 2063 |
| 10 | 4097 |
| 11 | 8194 |
| 12 | 16388 |
| 13 | 32831 |
| 14 | 65537 |
| 15 | 131074 |
| 16 | 262148 |
| 17 | 524303 |
| 18 | 1048577 |
| 19 | 2097154 |
| 20 | 4194308 |
| 21 | 8388639 |
| 22 | 16777217 |
| 23 | 33554434 |
| 24 | 67108868 |
| 25 | 134217743 |
| 26 | 268435457 |
| 27 | 536870914 |
| 28 | 1073741828 |
| 29 | 2147483775 |