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 | 7 |
| 1 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 15 |
| 5 | 31 |
| 6 | 63 |
| 7 | 127 |
| 8 | 247 |
| 9 | 493 |
| 10 | 983 |
| 11 | 1959 |
| 12 | 3903 |
| 13 | 7775 |
| 14 | 15487 |
| 15 | 30847 |
| 16 | 61447 |
| 17 | 122401 |
| 18 | 243819 |
| 19 | 485679 |
| 20 | 967455 |
| 21 | 1927135 |
| 22 | 3838783 |
| 23 | 7646719 |
| 24 | 15231991 |
| 25 | 30341581 |
| 26 | 60439343 |
| 27 | 120393007 |
| 28 | 239818559 |
| 29 | 477709983 |
| 30 | 951581183 |
| 31 | 1895515647 |
| 32 | 3775799303 |
| 33 | 7521257025 |