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 | 0 |
| 1 | 2 |
| 2 | 7 |
| 3 | 12 |
| 4 | 21 |
| 5 | 44 |
| 6 | 91 |
| 7 | 180 |
| 8 | 357 |
| 9 | 716 |
| 10 | 1435 |
| 11 | 2868 |
| 12 | 5733 |
| 13 | 11468 |
| 14 | 22939 |
| 15 | 45876 |
| 16 | 91749 |
| 17 | 183500 |
| 18 | 367003 |
| 19 | 734004 |
| 20 | 1468005 |
| 21 | 2936012 |
| 22 | 5872027 |
| 23 | 11744052 |
| 24 | 23488101 |
| 25 | 46976204 |
| 26 | 93952411 |
| 27 | 187904820 |
| 28 | 375809637 |
| 29 | 751619276 |
| 30 | 1503238555 |
| 31 | 3006477108 |