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 | 10 |
| 1 | 19 |
| 2 | 37 |
| 3 | 73 |
| 4 | 145 |
| 5 | 289 |
| 6 | 577 |
| 7 | 1153 |
| 8 | 2305 |
| 9 | 4609 |
| 10 | 9217 |
| 11 | 18433 |
| 12 | 36865 |
| 13 | 73729 |
| 14 | 147457 |
| 15 | 294913 |
| 16 | 589825 |
| 17 | 1179649 |
| 18 | 2359297 |
| 19 | 4718593 |
| 20 | 9437185 |
| 21 | 18874369 |
| 22 | 37748737 |
| 23 | 75497473 |
| 24 | 150994945 |
| 25 | 301989889 |
| 26 | 603979777 |
| 27 | 1207959553 |
| 28 | 2415919105 |
| 29 | 4831838209 |
| 30 | 9663676417 |
| 31 | 19327352833 |