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 | 3 |
| 2 | 5 |
| 3 | 11 |
| 4 | 23 |
| 5 | 45 |
| 6 | 91 |
| 7 | 183 |
| 8 | 365 |
| 9 | 731 |
| 10 | 1461 |
| 11 | 2923 |
| 12 | 5847 |
| 13 | 11693 |
| 14 | 23387 |
| 15 | 46775 |
| 16 | 93549 |
| 17 | 187099 |
| 18 | 374197 |
| 19 | 748395 |
| 20 | 1496791 |
| 21 | 2993581 |
| 22 | 5987163 |
| 23 | 11974327 |
| 24 | 23948653 |
| 25 | 47897307 |
| 26 | 95794615 |
| 27 | 191589229 |
| 28 | 383178459 |
| 29 | 766356917 |
| 30 | 1532713835 |
| 31 | 3065427671 |