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 | 0 |
| 2 | 1 |
| 3 | 3 |
| 4 | 6 |
| 5 | 13 |
| 6 | 26 |
| 7 | 53 |
| 8 | 106 |
| 9 | 212 |
| 10 | 424 |
| 11 | 849 |
| 12 | 1698 |
| 13 | 3397 |
| 14 | 6794 |
| 15 | 13588 |
| 16 | 27176 |
| 17 | 54353 |
| 18 | 108706 |
| 19 | 217413 |
| 20 | 434826 |
| 21 | 869652 |
| 22 | 1739304 |
| 23 | 3478609 |
| 24 | 6957218 |
| 25 | 13914436 |
| 26 | 27828872 |
| 27 | 55657744 |
| 28 | 111315488 |
| 29 | 222630977 |
| 30 | 445261954 |
| 31 | 890523909 |
| 32 | 1781047818 |
| 33 | 3562095636 |
| 34 | 7124191272 |